$ALK
ALASKA AIR GROUP, INC. Stock $alk

$alk Overview Financials Valuation SEC Filings Company Website

2011 Q4 Form 10-K Financial Statement

#000076642112000018 Filed on February 21, 2012

Income Statement

Concept	2011 Q4	2010 Q4	2009 Q4
Revenue	$1.044B	$958.5M	$846.1M
YoY Change	8.95%	13.28%	2.3%
Cost Of Revenue	$491.6M	$416.8M	$373.6M
YoY Change	17.95%	11.56%	-31.89%
Gross Profit	$552.7M	$541.7M	$472.5M
YoY Change	2.03%	14.65%	69.6%
Gross Profit Margin	52.93%	56.52%	55.84%
Selling, General & Admin	$314.1M	$309.0M	$307.1M
YoY Change	1.65%	0.62%	15.58%
% of Gross Profit	56.83%	57.04%	64.99%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$62.70M	$58.50M	$56.90M
YoY Change	7.18%	2.81%	10.06%
% of Gross Profit	11.34%	10.8%	12.04%
Operating Expenses	$438.6M	$422.4M	$419.7M
YoY Change	3.84%	0.64%	13.77%
Operating Profit	$114.1M	$119.3M	$52.80M
YoY Change	-4.36%	125.95%	-158.47%
Interest Expense	-$7.700M	-$18.70M	-$12.90M
YoY Change	-58.82%	44.96%	4.03%
% of Operating Profit	-6.75%	-15.67%	-24.43%
Other Income/Expense, Net	-$5.700M	$2.900M	$2.100M
YoY Change	-296.55%	38.1%	-333.33%
Pretax Income	$100.7M	$103.5M	$42.00M
YoY Change	-2.71%	146.43%	-135.0%
Income Tax	$36.70M	$38.70M	$17.90M
% Of Pretax Income	36.44%	37.39%	42.62%
Net Earnings	$64.00M	$64.80M	$24.10M
YoY Change	-1.23%	168.88%	-132.05%
Net Earnings / Revenue	6.13%	6.76%	2.85%
Basic Earnings Per Share
Diluted Earnings Per Share	$440.5K	$438.4K	$168.1K
COMMON SHARES
Basic Shares Outstanding	35.51M shares
Diluted Shares Outstanding

Balance Sheet

Concept	2011 Q4	2010 Q4	2009 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments	$1.141B	$1.208B	$1.192B
YoY Change	-5.55%	1.34%	10.68%
Cash & Equivalents	$102.0M	$90.00M	$164.0M
Short-Term Investments	$1.039B	$1.119B	$1.028B
Other Short-Term Assets	$19.20M	$14.00M	$285.0M
YoY Change	37.14%	-95.09%	8.37%
Inventory	$44.00M	$45.10M	$45.80M
Prepaid Expenses
Receivables	$136.0M	$120.0M	$112.0M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$1.596B	$1.662B	$1.634B
YoY Change	-3.97%	1.69%	8.3%
LONG-TERM ASSETS
Property, Plant & Equipment	$3.373B	$3.148B	$3.168B
YoY Change	7.13%	-0.62%	0.0%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments	$70.00M	$70.00M	$51.00M
YoY Change	0.0%	37.25%	41.67%
Other Assets	$128.0M	$136.3M	$143.2M
YoY Change	-6.09%	-4.82%	16.42%
Total Long-Term Assets	$3.571B	$3.355B	$3.362B
YoY Change	6.45%	-0.22%	1.05%
TOTAL ASSETS
Total Short-Term Assets	$1.596B	$1.662B	$1.634B
Total Long-Term Assets	$3.571B	$3.355B	$3.362B
Total Assets	$5.167B	$5.017B	$4.996B
YoY Change	3.0%	0.41%	3.31%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$104.0M	$60.20M	$63.30M
YoY Change	72.76%	-4.9%	5.5%
Accrued Expenses	$513.0M	$501.2M	$474.5M
YoY Change	2.35%	5.63%	-54.02%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$208.0M	$221.2M	$156.0M
YoY Change	-5.97%	41.79%	-36.33%
Total Short-Term Liabilities	$1.510B	$1.425B	$1.270B
YoY Change	5.99%	12.23%	-6.72%
LONG-TERM LIABILITIES
Long-Term Debt	$1.099B	$1.313B	$1.699B
YoY Change	-16.3%	-22.73%	6.47%
Other Long-Term Liabilities	$148.0M	$123.0M	$148.2M
YoY Change	20.33%	-17.0%	-87.44%
Total Long-Term Liabilities	$1.384B	$1.174B	$1.155B
YoY Change	17.94%	1.57%	-58.38%
TOTAL LIABILITIES
Total Short-Term Liabilities	$1.510B	$1.425B	$1.270B
Total Long-Term Liabilities	$1.384B	$1.174B	$1.155B
Total Liabilities	$2.894B	$2.598B	$2.425B
YoY Change	11.38%	7.15%	-41.9%
SHAREHOLDERS EQUITY
Retained Earnings	$811.0M	$566.1M	$315.0M
YoY Change	43.26%	79.71%
Common Stock	$878.0M	$852.5M	$802.8M
YoY Change	2.99%	6.19%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$125.0M	$46.00M	$5.700M
YoY Change	171.74%	707.02%
Treasury Stock Shares	4.783M shares	1.086M shares	252.1K shares
Shareholders Equity	$1.174B	$1.106B	$872.0M
YoY Change
Total Liabilities & Shareholders Equity	$5.167B	$5.017B	$4.996B
YoY Change	3.0%	0.41%	3.31%

Cashflow Statement

Concept	2011 Q4	2010 Q4	2009 Q4
OPERATING ACTIVITIES
Net Income	$64.00M	$64.80M	$24.10M
YoY Change	-1.23%	168.88%	-132.05%
Depreciation, Depletion And Amortization	$62.70M	$58.50M	$56.90M
YoY Change	7.18%	2.81%	10.06%
Cash From Operating Activities	$87.20M	$46.30M	-$13.10M
YoY Change	88.34%	-453.44%	-141.59%
INVESTING ACTIVITIES
Capital Expenditures	-$12.50M	-$31.40M	-$91.10M
YoY Change	-60.19%	-65.53%	3860.87%
Acquisitions
YoY Change
Other Investing Activities	$47.80M	$35.20M	$27.00M
YoY Change	35.8%	30.37%	-2.88%
Cash From Investing Activities	$35.30M	$3.800M	-$64.10M
YoY Change	828.95%	-105.93%	-351.37%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-87.80M	-89.80M	71.40M
YoY Change	-2.23%	-225.77%	-315.06%
NET CHANGE
Cash From Operating Activities	87.20M	46.30M	-13.10M
Cash From Investing Activities	35.30M	3.800M	-64.10M
Cash From Financing Activities	-87.80M	-89.80M	71.40M
Net Change In Cash	34.70M	-39.70M	-5.800M
YoY Change	-187.41%	584.48%	-124.37%
FREE CASH FLOW
Cash From Operating Activities	$87.20M	$46.30M	-$13.10M
Capital Expenditures	-$12.50M	-$31.40M	-$91.10M
Free Cash Flow	$99.70M	$77.70M	$78.00M
YoY Change	28.31%	-0.38%	130.77%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2011Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	103600000	USD
CY2010Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	60200000	USD
CY2011Q4	us-gaap	Accrual For Taxes Other Than Income Taxes Current AccrualForTaxesOtherThanIncomeTaxesCurrent	71500000	USD
CY2010Q4	us-gaap	Accrual For Taxes Other Than Income Taxes Current AccrualForTaxesOtherThanIncomeTaxesCurrent	67000000	USD
CY2011Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	513300000	USD
CY2010Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	501200000	USD
CY2011Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	1665100000	USD
CY2010Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	1509500000	USD
CY2010Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	8000000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	5700000	USD
CY2010Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	-5500000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	-15700000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-390000000	USD
CY2010Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-267200000	USD
CY2010Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	815500000	USD
CY2011Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	840000000	USD
CY2011	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	11600000	USD
CY2009	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	11900000	USD
CY2010	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	13700000	USD
CY2011	us-gaap	Advertising Cost Policy Expensed Advertising Cost AdvertisingCostPolicyExpensedAdvertisingCost	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"></font></div><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;color:#4bacc6;font-style:italic;font-weight:bold;">Selling Expenses</font></div><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Selling expenses include credit card fees, global distribution systems charges, the estimated cost of Mileage Plan free travel awards earned through air travel, advertising, promotional costs, commissions, and incentives. Advertising production costs are expensed the first time the advertising takes place. </font></div></div>
CY2010	us-gaap	Advertising Expense AdvertisingExpense	16000000	USD
CY2009	us-gaap	Advertising Expense AdvertisingExpense	16800000	USD
CY2011	us-gaap	Advertising Expense AdvertisingExpense	16100000	USD
CY2009	us-gaap	Aircraft Maintenance Materials And Repairs AircraftMaintenanceMaterialsAndRepairs	223100000	USD
CY2010	us-gaap	Aircraft Maintenance Materials And Repairs AircraftMaintenanceMaterialsAndRepairs	216500000	USD
CY2011	us-gaap	Aircraft Maintenance Materials And Repairs AircraftMaintenanceMaterialsAndRepairs	205600000	USD
CY2010	us-gaap	Aircraft Rental AircraftRental	138900000	USD
CY2009	us-gaap	Aircraft Rental AircraftRental	153700000	USD
CY2011	us-gaap	Aircraft Rental AircraftRental	116300000	USD
CY2011Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	800000	USD
CY2010Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	900000	USD
CY2011Q4	us-gaap	Assets Assets	5195000000	USD
CY2010Q4	us-gaap	Assets Assets	5016600000	USD
CY2011Q4	us-gaap	Assets Current AssetsCurrent	1595500000	USD
CY2010Q4	us-gaap	Assets Current AssetsCurrent	1662000000	USD
CY2010Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	1105800000	USD
CY2011Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	1029500000	USD
CY2011Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	208200000	USD
CY2010Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	345000000	USD
CY2011Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	204200000	USD
CY2010Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	290900000	USD
CY2011Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	4000000	USD
CY2010Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	54100000	USD
CY2010Q4	us-gaap	Available For Sale Securities Current AvailableForSaleSecuritiesCurrent	1118700000	USD
CY2011Q4	us-gaap	Available For Sale Securities Current AvailableForSaleSecuritiesCurrent	1038700000	USD
CY2010	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	10400000	USD
CY2009	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	7000000	USD
CY2011	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	7500000	USD
CY2011	us-gaap	Available For Sale Securities Gross Realized Gains Losses Sale Proceeds AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds	955700000	USD
CY2010	us-gaap	Available For Sale Securities Gross Realized Gains Losses Sale Proceeds AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds	931000000	USD
CY2009	us-gaap	Available For Sale Securities Gross Realized Gains Losses Sale Proceeds AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds	725000000	USD
CY2010	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	2300000	USD
CY2011	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	2300000	USD
CY2009	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	2300000	USD
CY2010Q4	us-gaap	Available For Sale Securities Gross Unrealized Losses1 AvailableForSaleSecuritiesGrossUnrealizedLosses1	3400000	USD
CY2011Q4	us-gaap	Available For Sale Securities Gross Unrealized Losses1 AvailableForSaleSecuritiesGrossUnrealizedLosses1	3000000	USD
CY2011Q4	us-gaap	Availableforsale Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses1 AvailableforsaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses1	300000	USD
CY2010Q4	us-gaap	Availableforsale Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses1 AvailableforsaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses1	1200000	USD
CY2011Q4	us-gaap	Availableforsale Securities Continuous Unrealized Loss Position Aggregate Losses1 AvailableforsaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses1	3000000	USD
CY2010Q4	us-gaap	Availableforsale Securities Continuous Unrealized Loss Position Aggregate Losses1 AvailableforsaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses1	3400000	USD
CY2011Q4	us-gaap	Availableforsale Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses1 AvailableforsaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses1	2700000	USD
CY2010Q4	us-gaap	Availableforsale Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses1 AvailableforsaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses1	2200000	USD
CY2010Q4	us-gaap	Availableforsale Securities Gross Unrealized Gain AvailableforsaleSecuritiesGrossUnrealizedGain	16300000	USD
CY2011Q4	us-gaap	Availableforsale Securities Gross Unrealized Gain AvailableforsaleSecuritiesGrossUnrealizedGain	12200000	USD
CY2010Q4	us-gaap	Bank Overdrafts BankOverdrafts	23300000	USD
CY2011Q4	us-gaap	Bank Overdrafts BankOverdrafts	26000000	USD
CY2011Q4	us-gaap	Capital Lease Obligations Current CapitalLeaseObligationsCurrent	31600000	USD
CY2010Q4	us-gaap	Capital Lease Obligations Current CapitalLeaseObligationsCurrent	43100000	USD
CY2011	us-gaap	Cargo And Freight Revenue CargoAndFreightRevenue	108700000	USD
CY2010	us-gaap	Cargo And Freight Revenue CargoAndFreightRevenue	106200000	USD
CY2009	us-gaap	Cargo And Freight Revenue CargoAndFreightRevenue	95900000	USD
CY2010Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	89500000	USD
CY2011Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	102200000	USD
CY2008Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	283100000	USD
CY2009Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	164200000	USD
CY2009	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-118900000	USD
CY2010	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-74700000	USD
CY2011	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	12700000	USD
CY2010Q4	us-gaap	Cash Cash Equivalents And Short Term Investments CashCashEquivalentsAndShortTermInvestments	1208200000	USD
CY2011Q4	us-gaap	Cash Cash Equivalents And Short Term Investments CashCashEquivalentsAndShortTermInvestments	1140900000	USD
CY2010Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2011Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2010Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	1
CY2011Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	1
CY2010Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	100000000	shares
CY2011Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	100000000	shares
CY2011Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	37866522	shares
CY2010Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	37010140	shares
CY2010Q4	us-gaap	Common Stock Value CommonStockValue	37000000	USD
CY2011Q4	us-gaap	Common Stock Value CommonStockValue	37900000	USD
CY2009	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-4700000	USD
CY2010	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	10100000	USD
CY2011	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	0	USD
CY2009	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-3400000	USD
CY2010	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	7400000	USD
CY2011	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	3500000	USD
CY2010	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	2700000	USD
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CY2011	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	3500000	USD
CY2011Q4	us-gaap	Debt Current DebtCurrent	207900000	USD
CY2010Q4	us-gaap	Debt Current DebtCurrent	221200000	USD
CY2011	us-gaap	Debt Instrument Periodic Payment DebtInstrumentPeriodicPayment	168800000	USD
CY2011Q4	us-gaap	Deferred Air Traffic Revenue DeferredAirTrafficRevenue	489400000	USD
CY2010Q4	us-gaap	Deferred Air Traffic Revenue DeferredAirTrafficRevenue	422400000	USD
CY2010Q4	us-gaap	Deferred Costs DeferredCosts	31100000	USD
CY2011Q4	us-gaap	Deferred Costs DeferredCosts	32000000	USD
CY2009	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	76700000	USD
CY2011	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	134900000	USD
CY2010	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	131500000	USD
CY2011	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	145700000	USD
CY2009	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	86000000	USD
CY2010	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	144700000	USD
CY2010Q4	us-gaap	Deferred Revenue DeferredRevenue	403500000	USD
CY2011Q4	us-gaap	Deferred Revenue DeferredRevenue	410200000	USD
CY2009	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	9300000	USD
CY2010	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	13200000	USD
CY2011	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	10800000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Deferred Income DeferredTaxAssetsDeferredIncome	14100000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Deferred Income DeferredTaxAssetsDeferredIncome	15900000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Derivative Instruments DeferredTaxAssetsDerivativeInstruments	2800000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Derivative Instruments DeferredTaxAssetsDerivativeInstruments	0	USD
CY2010Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	526200000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	583400000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Inventory DeferredTaxAssetsInventory	13400000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Inventory DeferredTaxAssetsInventory	16500000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	-228700000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	-159400000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Liabilities Net Current DeferredTaxAssetsLiabilitiesNetCurrent	134200000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Liabilities Net Current DeferredTaxAssetsLiabilitiesNetCurrent	120500000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Liabilities Net Noncurrent DeferredTaxAssetsLiabilitiesNetNoncurrent	-362900000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Liabilities Net Noncurrent DeferredTaxAssetsLiabilitiesNetNoncurrent	-279900000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Net Current DeferredTaxAssetsNetCurrent	134200000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Net Current DeferredTaxAssetsNetCurrent	120500000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	4100000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	13000000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	15900000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	27500000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	57500000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	53100000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	179100000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	217600000	USD
CY2010Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	685600000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	812100000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Derivatives DeferredTaxLiabilitiesDerivatives	0	USD
CY2010Q4	us-gaap	Deferred Tax Liabilities Derivatives DeferredTaxLiabilitiesDerivatives	8700000	USD
CY2010Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	279900000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	362900000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	16900000	USD
CY2010Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	16900000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	795200000	USD
CY2010Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	660000000	USD
CY2011Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate	0.0465
CY2010Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate	0.0555
CY2011Q4	us-gaap	Defined Benefit Plan Year That Rate Reaches Ultimate Trend Rate DefinedBenefitPlanYearThatRateReachesUltimateTrendRate	2028
CY2009	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	28600000	USD
CY2011	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	42000000	USD
CY2010	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	40000000	USD
CY2011Q4	us-gaap	Deposits On Flight Equipment DepositsOnFlightEquipment	262500000	USD
CY2010Q4	us-gaap	Deposits On Flight Equipment DepositsOnFlightEquipment	202500000	USD
CY2011	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	246900000	USD
CY2009	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	219200000	USD
CY2010	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	230500000	USD
CY2010Q4	us-gaap	Derivative Instruments And Hedges DerivativeInstrumentsAndHedges	61400000	USD
CY2011Q4	us-gaap	Derivative Instruments And Hedges DerivativeInstrumentsAndHedges	46700000	USD
CY2011Q4	us-gaap	Derivative Instruments And Hedges Noncurrent DerivativeInstrumentsAndHedgesNoncurrent	70200000	USD
CY2010Q4	us-gaap	Derivative Instruments And Hedges Noncurrent DerivativeInstrumentsAndHedgesNoncurrent	69900000	USD
CY2009	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.39
CY2010	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	7.01
CY2011	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	6.81
CY2011	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	6.66
CY2009	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.36
CY2010	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	6.83
CY2011	us-gaap	Earnings Per Share Policy Diluted EarningsPerSharePolicyDiluted	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;color:#4bacc6;font-style:italic;font-weight:bold;">Earnings Per Share (EPS)</font></div><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Diluted EPS is calculated by dividing net income by the average common shares outstanding plus additional common shares that would have been outstanding assuming the exercise of in-the-money stock options and restricted stock units, using the treasury-stock method.</font></div></div>
CY2010	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.381
CY2009	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.401
CY2011	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.379
CY2011	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2010	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2009	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2011Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	163800000	USD
CY2010Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	176600000	USD
CY2011Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	8800000	USD
CY2011	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition	1.7	years
CY2009	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	4000000	USD
CY2011	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	4200000	USD
CY2010	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	4900000	USD
CY2010Q4	us-gaap	Energy Related Inventory EnergyRelatedInventory	20200000	USD
CY2011Q4	us-gaap	Energy Related Inventory EnergyRelatedInventory	19600000	USD
CY2010Q4	us-gaap	Flight Equipment Gross FlightEquipmentGross	3807600000	USD
CY2011Q4	us-gaap	Flight Equipment Gross FlightEquipmentGross	4041800000	USD
CY2011	us-gaap	Food And Beverage Cost Of Sales FoodAndBeverageCostOfSales	67200000	USD
CY2009	us-gaap	Food And Beverage Cost Of Sales FoodAndBeverageCostOfSales	50100000	USD
CY2010	us-gaap	Food And Beverage Cost Of Sales FoodAndBeverageCostOfSales	57500000	USD
CY2010	us-gaap	Fuel Costs FuelCosts	900900000	USD
CY2011	us-gaap	Fuel Costs FuelCosts	1297700000	USD
CY2009	us-gaap	Fuel Costs FuelCosts	658100000	USD
CY2009	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	202900000	USD
CY2010	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	405900000	USD
CY2011	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	393700000	USD
CY2010	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	405900000	USD
CY2011	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	393700000	USD
CY2009	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	202900000	USD
CY2011	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	149200000	USD
CY2009	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	81300000	USD
CY2010	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	154800000	USD
CY2010	us-gaap	Income Tax Expense Benefit Continuing Operations IncomeTaxExpenseBenefitContinuingOperations	154800000	USD
CY2009	us-gaap	Income Tax Expense Benefit Continuing Operations IncomeTaxExpenseBenefitContinuingOperations	81300000	USD
CY2011	us-gaap	Income Tax Expense Benefit Continuing Operations IncomeTaxExpenseBenefitContinuingOperations	149200000	USD
CY2011	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	137800000	USD
CY2009	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	71000000	USD
CY2010	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	142100000	USD
CY2010	us-gaap	Income Tax Reconciliation Nondeductible Expense IncomeTaxReconciliationNondeductibleExpense	1800000	USD
CY2011	us-gaap	Income Tax Reconciliation Nondeductible Expense IncomeTaxReconciliationNondeductibleExpense	1400000	USD
CY2009	us-gaap	Income Tax Reconciliation Nondeductible Expense IncomeTaxReconciliationNondeductibleExpense	3100000	USD
CY2010	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	200000	USD
CY2009	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	1700000	USD
CY2011	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-200000	USD
CY2009	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	5500000	USD
CY2010	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	10700000	USD
CY2011	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	10200000	USD
CY2010	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	400000	USD
CY2009	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-8800000	USD
CY2011	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	7500000	USD
CY2010	us-gaap	Increase Decrease In Air Traffic Liability1 IncreaseDecreaseInAirTrafficLiability1	56100000	USD
CY2011	us-gaap	Increase Decrease In Air Traffic Liability1 IncreaseDecreaseInAirTrafficLiability1	67000000	USD
CY2009	us-gaap	Increase Decrease In Air Traffic Liability1 IncreaseDecreaseInAirTrafficLiability1	-6400000	USD
CY2009	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-84100000	USD
CY2010	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-145300000	USD
CY2011	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-144800000	USD
CY2011	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	6700000	USD
CY2010	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	-31600000	USD
CY2009	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	17300000	USD
CY2010	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	28700000	USD
CY2011	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	69900000	USD
CY2009	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	69100000	USD
CY2009	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	7600000	USD
CY2010	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	6200000	USD
CY2011	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	12500000	USD
CY2009	us-gaap	Interest Expense InterestExpense	104300000	USD
CY2011	us-gaap	Interest Expense InterestExpense	87300000	USD
CY2010	us-gaap	Interest Expense InterestExpense	108300000	USD
CY2011	us-gaap	Interest Paid Net InterestPaidNet	73600000	USD
CY2009	us-gaap	Interest Paid Net InterestPaidNet	94600000	USD
CY2010	us-gaap	Interest Paid Net InterestPaidNet	106000000	USD
CY2010Q4	us-gaap	Inventory Net InventoryNet	45100000	USD
CY2011Q4	us-gaap	Inventory Net InventoryNet	44300000	USD
CY2011Q4	us-gaap	Inventory Valuation Reserves InventoryValuationReserves	23300000	USD
CY2010Q4	us-gaap	Inventory Valuation Reserves InventoryValuationReserves	29000000	USD
CY2011	us-gaap	Investment Income Interest InvestmentIncomeInterest	21900000	USD
CY2010	us-gaap	Investment Income Interest InvestmentIncomeInterest	29400000	USD
CY2009	us-gaap	Investment Income Interest InvestmentIncomeInterest	32600000	USD
CY2010	us-gaap	Labor And Related Expense LaborAndRelatedExpense	960900000	USD
CY2009	us-gaap	Labor And Related Expense LaborAndRelatedExpense	988100000	USD
CY2011	us-gaap	Labor And Related Expense LaborAndRelatedExpense	990500000	USD
CY2011	us-gaap	Landing Fees And Other Rentals LandingFeesAndOtherRentals	238200000	USD
CY2009	us-gaap	Landing Fees And Other Rentals LandingFeesAndOtherRentals	223200000	USD
CY2010	us-gaap	Landing Fees And Other Rentals LandingFeesAndOtherRentals	232800000	USD
CY2009	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	303100000	USD
CY2011	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	274900000	USD
CY2010	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	294500000	USD
CY2011Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	5195000000	USD
CY2010Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	5016600000	USD
CY2011Q4	us-gaap	Liabilities Current LiabilitiesCurrent	1509600000	USD
CY2010Q4	us-gaap	Liabilities Current LiabilitiesCurrent	1424700000	USD
CY2010Q4	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	1173500000	USD
CY2011Q4	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	1413200000	USD
CY2010	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-295200000	USD
CY2011Q4	us-gaap	Long Term Debt LongTermDebt	1306900000	USD
CY2010Q4	us-gaap	Long Term Debt LongTermDebt	1534200000	USD
CY2010Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	221200000	USD
CY2011Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	207900000	USD
CY2011Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	575400000	USD
CY2011Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	207900000	USD
CY2011Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	116500000	USD
CY2011Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	118900000	USD
CY2011Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	122300000	USD
CY2011Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	165900000	USD
CY2011Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	1099000000	USD
CY2010Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	1313000000	USD
CY2010Q4	us-gaap	Long Term Debt Percentage Bearing Fixed Interest Rate LongTermDebtPercentageBearingFixedInterestRate	0.060
CY2011Q4	us-gaap	Long Term Debt Percentage Bearing Fixed Interest Rate LongTermDebtPercentageBearingFixedInterestRate	0.058
CY2011Q4	us-gaap	Long Term Debt Percentage Bearing Variable Interest Rate LongTermDebtPercentageBearingVariableInterestRate	0.019
CY2010Q4	us-gaap	Long Term Debt Percentage Bearing Variable Interest Rate LongTermDebtPercentageBearingVariableInterestRate	0.018
CY2011	us-gaap	Loss Contingency Disclosures LossContingencyDisclosures	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">CONTINGENCIES</font></div><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;color:#4bacc6;font-style:italic;font-weight:bold;">Other items</font></div><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The Company is a party to routine litigation matters incidental to its business and with respect to which no material liability is expected. Management believes the ultimate disposition of these matters is not likely to materially affect the Company's financial position or results of operations. This forward-looking statement is based on management's current understanding of the relevant law and facts, and it is subject to various contingencies, including the potential costs and risks associated with litigation and the actions of arbitrators, judges and juries. </font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The SEC has formally notified Mr. Ayer that the inquiry discussed in our 2010 Form 10-K has been closed.</font></div><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"></font></div></div>
CY2010Q4	us-gaap	Marketable Securities Current MarketableSecuritiesCurrent	1118700000	USD
CY2011Q4	us-gaap	Marketable Securities Current MarketableSecuritiesCurrent	1038700000	USD
CY2010Q4	us-gaap	Money Market Funds At Carrying Value MoneyMarketFundsAtCarryingValue	82900000	USD
CY2011Q4	us-gaap	Money Market Funds At Carrying Value MoneyMarketFundsAtCarryingValue	40100000	USD
CY2009	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	246000000	USD
CY2011	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-280000000	USD
CY2010	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-332200000	USD
CY2011	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-403300000	USD
CY2009	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-657400000	USD
CY2010	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	552700000	USD
CY2009	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	292500000	USD
CY2011	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	696000000	USD
CY2011	us-gaap	Net Income Loss NetIncomeLoss	244500000	USD
CY2009	us-gaap	Net Income Loss NetIncomeLoss	121600000	USD
CY2010	us-gaap	Net Income Loss NetIncomeLoss	251100000	USD
CY2010	us-gaap	Noncash Or Part Noncash Acquisition Other Assets Acquired1 NoncashOrPartNoncashAcquisitionOtherAssetsAcquired1	7400000	USD
CY2009	us-gaap	Noncash Or Part Noncash Acquisition Other Assets Acquired1 NoncashOrPartNoncashAcquisitionOtherAssetsAcquired1	0	USD
CY2011	us-gaap	Noncash Or Part Noncash Acquisition Other Assets Acquired1 NoncashOrPartNoncashAcquisitionOtherAssetsAcquired1	15600000	USD
CY2009	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-64500000	USD
CY2010	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-65700000	USD
CY2011	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-55200000	USD
CY2009	us-gaap	Operating Expenses OperatingExpenses	3132400000	USD
CY2011	us-gaap	Operating Expenses OperatingExpenses	3868900000	USD
CY2010	us-gaap	Operating Expenses OperatingExpenses	3360700000	USD
CY2010	us-gaap	Operating Income Loss OperatingIncomeLoss	471600000	USD
CY2009	us-gaap	Operating Income Loss OperatingIncomeLoss	267400000	USD
CY2011	us-gaap	Operating Income Loss OperatingIncomeLoss	448900000	USD
CY2011Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	148600000	USD
CY2010Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	143000000	USD
CY2011Q4	us-gaap	Other Assets Current OtherAssetsCurrent	19200000	USD
CY2010Q4	us-gaap	Other Assets Current OtherAssetsCurrent	14000000	USD
CY2010Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	136300000	USD
CY2011Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	127800000	USD
CY2011	us-gaap	Other Comprehensive Income Available For Sale Securities Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeAvailableForSaleSecuritiesAdjustmentNetOfTaxPeriodIncreaseDecrease	-2300000	USD
CY2010	us-gaap	Other Comprehensive Income Available For Sale Securities Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeAvailableForSaleSecuritiesAdjustmentNetOfTaxPeriodIncreaseDecrease	-700000	USD
CY2009	us-gaap	Other Comprehensive Income Available For Sale Securities Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeAvailableForSaleSecuritiesAdjustmentNetOfTaxPeriodIncreaseDecrease	11200000	USD
CY2011	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecrease	-10200000	USD
CY2009	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecrease	1500000	USD
CY2010	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecrease	-7000000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Net Of Tax Period Increase Decrease OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease	121700000	USD
CY2009	us-gaap	Other Comprehensive Income Loss Net Of Tax Period Increase Decrease OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease	209900000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Net Of Tax Period Increase Decrease OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease	223900000	USD
CY2010	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	200700000	USD
CY2011	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	235300000	USD
CY2009	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	213900000	USD
CY2011	us-gaap	Other Labor Related Expenses OtherLaborRelatedExpenses	71900000	USD
CY2010	us-gaap	Other Labor Related Expenses OtherLaborRelatedExpenses	92000000	USD
CY2009	us-gaap	Other Labor Related Expenses OtherLaborRelatedExpenses	76000000	USD
CY2011Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	176700000	USD
CY2010Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	123000000	USD
CY2011	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-2300000	USD
CY2009	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-400000	USD
CY2010	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	7000000	USD
CY2010	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	15100000	USD
CY2009	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	-8100000	USD
CY2011	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	-12800000	USD
CY2010Q4	us-gaap	Other Prepaid Expense Current OtherPrepaidExpenseCurrent	28700000	USD
CY2011Q4	us-gaap	Other Prepaid Expense Current OtherPrepaidExpenseCurrent	30500000	USD
CY2010Q4	us-gaap	Other Receivables Gross Current OtherReceivablesGrossCurrent	29500000	USD
CY2011Q4	us-gaap	Other Receivables Gross Current OtherReceivablesGrossCurrent	30500000	USD
CY2011	us-gaap	Other Sales Revenue Net OtherSalesRevenueNet	258400000	USD
CY2010	us-gaap	Other Sales Revenue Net OtherSalesRevenueNet	237500000	USD
CY2009	us-gaap	Other Sales Revenue Net OtherSalesRevenueNet	196500000	USD
CY2009	us-gaap	Other Than Temporary Impairment Losses Investments Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities	2200000	USD
CY2010	us-gaap	Other Than Temporary Impairment Losses Investments Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities	0	USD
CY2011	us-gaap	Other Than Temporary Impairment Losses Investments Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities	2200000	USD
CY2011	us-gaap	Passenger Revenue PassengerRevenue	3950700000	USD
CY2010	us-gaap	Passenger Revenue PassengerRevenue	3488600000	USD
CY2009	us-gaap	Passenger Revenue PassengerRevenue	3107400000	USD
CY2009	us-gaap	Passenger Revenue Mainline PassengerRevenueMainline	2438800000	USD
CY2011	us-gaap	Passenger Revenue Mainline PassengerRevenueMainline	3176200000	USD
CY2010	us-gaap	Passenger Revenue Mainline PassengerRevenueMainline	2763400000	USD
CY2009	us-gaap	Passenger Revenue Regional PassengerRevenueRegional	668600000	USD
CY2010	us-gaap	Passenger Revenue Regional PassengerRevenueRegional	725200000	USD
CY2011	us-gaap	Passenger Revenue Regional PassengerRevenueRegional	774500000	USD
CY2009	us-gaap	Payments For Construction In Process PaymentsForConstructionInProcess	0	USD
CY2011	us-gaap	Payments For Construction In Process PaymentsForConstructionInProcess	108900000	USD
CY2010	us-gaap	Payments For Construction In Process PaymentsForConstructionInProcess	29000000	USD
CY2011	us-gaap	Payments For Flight Equipment PaymentsForFlightEquipment	317800000	USD
CY2009	us-gaap	Payments For Flight Equipment PaymentsForFlightEquipment	367200000	USD
CY2010	us-gaap	Payments For Flight Equipment PaymentsForFlightEquipment	138600000	USD
CY2011	us-gaap	Payments For Proceeds From Hedge Investing Activities PaymentsForProceedsFromHedgeInvestingActivities	-15900000	USD
CY2010	us-gaap	Payments For Proceeds From Hedge Investing Activities PaymentsForProceedsFromHedgeInvestingActivities	16300000	USD
CY2009	us-gaap	Payments For Proceeds From Hedge Investing Activities PaymentsForProceedsFromHedgeInvestingActivities	60500000	USD
CY2010	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-10100000	USD
CY2009	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	1400000	USD
CY2011	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-20800000	USD
CY2010	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	45100000	USD
CY2011	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	79500000	USD
CY2009	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	23800000	USD
CY2011	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	883500000	USD
CY2010	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	1022000000	USD
CY2009	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	942600000	USD
CY2010	us-gaap	Payments To Acquire Other Productive Assets PaymentsToAcquireOtherProductiveAssets	27200000	USD
CY2009	us-gaap	Payments To Acquire Other Productive Assets PaymentsToAcquireOtherProductiveAssets	30600000	USD
CY2011	us-gaap	Payments To Acquire Other Productive Assets PaymentsToAcquireOtherProductiveAssets	35200000	USD
CY2010	us-gaap	Payments To Acquire Other Property Plant And Equipment PaymentsToAcquireOtherPropertyPlantAndEquipment	19500000	USD
CY2009	us-gaap	Payments To Acquire Other Property Plant And Equipment PaymentsToAcquireOtherPropertyPlantAndEquipment	40600000	USD
CY2011	us-gaap	Payments To Acquire Other Property Plant And Equipment PaymentsToAcquireOtherPropertyPlantAndEquipment	34400000	USD
CY2010	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	185300000	USD
CY2011	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	387400000	USD
CY2009	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	438400000	USD
CY2010	us-gaap	Pension And Other Postretirement Benefit Contributions PensionAndOtherPostretirementBenefitContributions	150500000	USD
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	2507982	shares
CY2011	us-gaap	Pension And Other Postretirement Benefit Contributions PensionAndOtherPostretirementBenefitContributions	140800000	USD
CY2009	us-gaap	Pension And Other Postretirement Benefit Contributions PensionAndOtherPostretirementBenefitContributions	152800000	USD
CY2010Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	367100000	USD
CY2011Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	463400000	USD
CY2010Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	1
CY2011Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	1
CY2010Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000	shares
CY2011Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000	shares
CY2010Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2011Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2011Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2010Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2011Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2010Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2010Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	106700000	USD
CY2011Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	93000000	USD
CY2011Q4	us-gaap	Prepaid Expense Noncurrent PrepaidExpenseNoncurrent	12800000	USD
CY2010Q4	us-gaap	Prepaid Expense Noncurrent PrepaidExpenseNoncurrent	21600000	USD
CY2010Q4	us-gaap	Prepaid Rent PrepaidRent	42500000	USD
CY2011Q4	us-gaap	Prepaid Rent PrepaidRent	29500000	USD
CY2011Q4	us-gaap	Price Risk Cash Flow Hedge Unrealized Gain Loss To Be Reclassified During Next12 Months PriceRiskCashFlowHedgeUnrealizedGainLossToBeReclassifiedDuringNext12Months	5200000	USD
CY2010	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	36500000	USD
CY2009	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	13000000	USD
CY2011	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	19400000	USD
CY2010	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	USD
CY2009	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	275000000	USD
CY2011	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	106500000	USD
CY2009	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	12800000	USD
CY2010	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-2600000	USD
CY2011	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	7100000	USD
CY2009	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	725000000	USD
CY2011	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	955700000	USD
CY2010	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	931000000	USD
CY2010	us-gaap	Professional And Contract Services Expense ProfessionalAndContractServicesExpense	163000000	USD
CY2009	us-gaap	Professional And Contract Services Expense ProfessionalAndContractServicesExpense	150600000	USD
CY2011	us-gaap	Professional And Contract Services Expense ProfessionalAndContractServicesExpense	185100000	USD
CY2010Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	4657900000	USD
CY2011Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	5066600000	USD
CY2010Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	3148400000	USD
CY2011Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	3401500000	USD
CY2010Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	647800000	USD
CY2011Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	762300000	USD
CY2010Q4	us-gaap	Receivables Net Current ReceivablesNetCurrent	120100000	USD
CY2011Q4	us-gaap	Receivables Net Current ReceivablesNetCurrent	136400000	USD
CY2011	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	333500000	USD
CY2009	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	261000000	USD
CY2010	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	321000000	USD
CY2011Q4	us-gaap	Restricted Cash And Investments Noncurrent RestrictedCashAndInvestmentsNoncurrent	83000000	USD
CY2010Q4	us-gaap	Restricted Cash And Investments Noncurrent RestrictedCashAndInvestmentsNoncurrent	83600000	USD
CY2010	us-gaap	Restructuring And Related Cost Number Of Positions Eliminated RestructuringAndRelatedCostNumberOfPositionsEliminated	100	positions
CY2011	us-gaap	Restructuring Charges RestructuringCharges	38900000	USD
CY2010	us-gaap	Restructuring Charges RestructuringCharges	13200000	USD
CY2009	us-gaap	Restructuring Charges RestructuringCharges	24300000	USD
CY2009	us-gaap	Restructuring Settlement And Impairment Provisions RestructuringSettlementAndImpairmentProvisions	44600000	USD
CY2011	us-gaap	Restructuring Settlement And Impairment Provisions RestructuringSettlementAndImpairmentProvisions	38900000	USD
CY2010	us-gaap	Restructuring Settlement And Impairment Provisions RestructuringSettlementAndImpairmentProvisions	13200000	USD
CY2010Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	566100000	USD
CY2011Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	810600000	USD
CY2011	us-gaap	Revenue Recognition Deferred Revenue RevenueRecognitionDeferredRevenue	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;color:#549dc5;font-style:italic;font-weight:bold;"></font></div><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;color:#4bacc6;font-style:italic;font-weight:bold;">Deferred Revenue</font></div><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Deferred revenue results primarily from the sale of Mileage Plan miles to third-parties. This revenue is recognized when award transportation is provided or over the term of the applicable agreement.</font></div></div>
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Compensation Cost ShareBasedCompensationArrangementByShareBasedPaymentAwardCompensationCost	11600000	USD
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Maximum Employee Subscription Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate	0.10
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	6900000	shares
CY2009	us-gaap	Revenues From Transactions With Other Operating Segments Of Same Entity RevenuesFromTransactionsWithOtherOperatingSegmentsOfSameEntity	0	USD
CY2011	us-gaap	Revenues From Transactions With Other Operating Segments Of Same Entity RevenuesFromTransactionsWithOtherOperatingSegmentsOfSameEntity	0	USD
CY2010	us-gaap	Revenues From Transactions With Other Operating Segments Of Same Entity RevenuesFromTransactionsWithOtherOperatingSegmentsOfSameEntity	0	USD
CY2010	us-gaap	Sale Leaseback Transaction Net Proceeds SaleLeasebackTransactionNetProceeds	0	USD
CY2009	us-gaap	Sale Leaseback Transaction Net Proceeds SaleLeasebackTransactionNetProceeds	230000000	USD
CY2011	us-gaap	Sale Leaseback Transaction Net Proceeds SaleLeasebackTransactionNetProceeds	0	USD
CY2011	us-gaap	Sales Revenue Net SalesRevenueNet	4317800000	USD
CY2010	us-gaap	Sales Revenue Net SalesRevenueNet	3832300000	USD
CY2009	us-gaap	Sales Revenue Net SalesRevenueNet	3399800000	USD
CY2011	us-gaap	Selling Expense SellingExpense	175300000	USD
CY2009	us-gaap	Selling Expense SellingExpense	131800000	USD
CY2010	us-gaap	Selling Expense SellingExpense	153800000	USD
CY2010	us-gaap	Share Based Compensation ShareBasedCompensation	9100000	USD
CY2009	us-gaap	Share Based Compensation ShareBasedCompensation	12900000	USD
CY2011	us-gaap	Share Based Compensation ShareBasedCompensation	16500000	USD
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Compensation Cost ShareBasedCompensationArrangementByShareBasedPaymentAwardCompensationCost	13700000	USD
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Compensation Cost ShareBasedCompensationArrangementByShareBasedPaymentAwardCompensationCost	11900000	USD
CY2011Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	2391747	shares
CY2009	us-gaap	Treasury Stock Shares Retired TreasuryStockSharesRetired	7900000	shares
CY2010Q4	us-gaap	Treasury Stock Value TreasuryStockValue	46000000	USD
CY2011	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	2800000	USD
CY2009	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	3100000	USD
CY2010	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	0	USD
CY2011	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	11000000	USD
CY2010	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	36000000	USD
CY2009	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	7600000	USD
CY2011	us-gaap	Stock Issued During Period Value Treasury Stock Reissued StockIssuedDuringPeriodValueTreasuryStockReissued	200000	USD
CY2009	us-gaap	Stock Issued During Period Value Treasury Stock Reissued StockIssuedDuringPeriodValueTreasuryStockReissued	1500000	USD
CY2010	us-gaap	Stock Issued During Period Value Treasury Stock Reissued StockIssuedDuringPeriodValueTreasuryStockReissued	4800000	USD
CY2011	us-gaap	Stock Repurchase Program Authorized Amount StockRepurchaseProgramAuthorizedAmount	50000000	USD
CY2011	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	1309300	shares
CY2009	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	1324578	shares
CY2010	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	1000748	shares
CY2011	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	79500000	USD
CY2009	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	23800000	USD
CY2010	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	45100000	USD
CY2010Q4	us-gaap	Stockholders Equity StockholdersEquity	1105400000	USD
CY2011Q4	us-gaap	Stockholders Equity StockholdersEquity	1173200000	USD
CY2008Q4	us-gaap	Stockholders Equity StockholdersEquity	661900000	USD
CY2009Q4	us-gaap	Stockholders Equity StockholdersEquity	872100000	USD
CY2009	us-gaap	Treasury Stock Retired Cost Method Amount TreasuryStockRetiredCostMethodAmount	0	USD
CY2010Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	1086172	shares
CY2011Q4	us-gaap	Treasury Stock Value TreasuryStockValue	125300000	USD
CY2009	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	88700000	USD
CY2010	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	14300000	USD
CY2011	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	-14400000	USD
CY2011Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	600000	USD
CY2010Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1500000	USD
CY2009Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1300000	USD
CY2008Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	23700000	USD
CY2010	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2009	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	22500000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2010	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	200000	USD
CY2009	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	100000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	200000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2009	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2010	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2009	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	0	USD
CY2011	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	1100000	USD
CY2010	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	0	USD
CY2010	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	36786000	shares
CY2009	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	36154000	shares
CY2011	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	36710000	shares
CY2009	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	35815000	shares
CY2011	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	35878000	shares
CY2010	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	35822000	shares
CY2011Q4	alk	Airline Traffic Receivable Gross Current AirlineTrafficReceivableGrossCurrent	66500000	USD
CY2010Q4	alk	Airline Traffic Receivable Gross Current AirlineTrafficReceivableGrossCurrent	53600000	USD
CY2011Q4	alk	Available For Sale Maturing In More Then One Year And Less Then Two Years From Balance Sheet Date Percentage AvailableForSaleMaturingInMoreThenOneYearAndLessThenTwoYearsFromBalanceSheetDatePercentage	0.358
CY2011Q4	alk	Available For Sale Maturing In More Then Two Years From Balance Sheet Date Percentage AvailableForSaleMaturingInMoreThenTwoYearsFromBalanceSheetDatePercentage	0.408
CY2011Q4	alk	Available For Sale Maturing In One Year From Balance Sheet Date Percentage AvailableForSaleMaturingInOneYearFromBalanceSheetDatePercentage	0.234
CY2010Q4	alk	Cash1 Cash1	6600000	USD
CY2011Q4	alk	Cash1 Cash1	62100000	USD
CY2009	alk	Cash Payout Of Accrued Sick Leave Multiplied By Hourly Rate Percent CashPayoutOfAccruedSickLeaveMultipliedByHourlyRatePercent	0.25
CY2011	alk	Debt Agreements Number DebtAgreementsNumber	7	debtAgreements
CY2011	alk	Debt Agreements Number With Partial Debt Balance DebtAgreementsNumberWithPartialDebtBalance	4	debtAgreements
CY2011Q4	alk	Deferred Revenue Mileage Plan Awards Issued But Not Yet Flown DeferredRevenueMileagePlanAwardsIssuedButNotYetFlown	38500000	USD
CY2010Q4	alk	Deferred Revenue Mileage Plan Awards Issued But Not Yet Flown DeferredRevenueMileagePlanAwardsIssuedButNotYetFlown	43000000	USD
CY2010Q4	alk	Deferred Tax Assets Mileage Plan DeferredTaxAssetsMileagePlan	237200000	USD
CY2011Q4	alk	Deferred Tax Assets Mileage Plan DeferredTaxAssetsMileagePlan	241900000	USD
CY2011Q4	alk	Defined Benefit Plan Individual Equity Investment Percent Of Total Assets Maximum Allowable DefinedBenefitPlanIndividualEquityInvestmentPercentOfTotalAssetsMaximumAllowable	0.10
CY2010Q4	alk	Leased Aircraft Return Costs LeasedAircraftReturnCosts	2900000	USD
CY2011Q4	alk	Leased Aircraft Return Costs LeasedAircraftReturnCosts	2100000	USD
CY2010Q4	alk	Mileage Plan Current Liabilities MileagePlanCurrentLiabilities	278000000	USD
CY2011Q4	alk	Mileage Plan Current Liabilities MileagePlanCurrentLiabilities	271400000	USD
CY2011Q4	alk	Mileage Plan Receivables Gross Current MileagePlanReceivablesGrossCurrent	40200000	USD
CY2010Q4	alk	Mileage Plan Receivables Gross Current MileagePlanReceivablesGrossCurrent	37900000	USD
CY2009	alk	Operating Expenses Excluding Fuel OperatingExpensesExcludingFuel	2474300000	USD
CY2011	alk	Operating Expenses Excluding Fuel OperatingExpensesExcludingFuel	2571200000	USD
CY2010	alk	Operating Expenses Excluding Fuel OperatingExpensesExcludingFuel	2459800000	USD
CY2009	alk	Other Nonoperating Income Expense Other OtherNonoperatingIncomeExpenseOther	7200000	USD
CY2011	alk	Other Nonoperating Income Expense Other OtherNonoperatingIncomeExpenseOther	10200000	USD
CY2010	alk	Other Nonoperating Income Expense Other OtherNonoperatingIncomeExpenseOther	13200000	USD
CY2010Q4	alk	Prepaid Credit Card And Travel Agent Commissions PrepaidCreditCardAndTravelAgentCommissions	8900000	USD
CY2011Q4	alk	Prepaid Credit Card And Travel Agent Commissions PrepaidCreditCardAndTravelAgentCommissions	9800000	USD
CY2011Q4	alk	Prepaid Fuel PrepaidFuel	4000000	USD
CY2010Q4	alk	Prepaid Fuel PrepaidFuel	12600000	USD
CY2011	alk	Prepayments Of Long Term Debt PrepaymentsOfLongTermDebt	164700000	USD
CY2011	alk	Quarterly Payout To Employee Under Employee Incentive Plan Maximum QuarterlyPayoutToEmployeeUnderEmployeeIncentivePlanMaximum	300
CY2011	alk	Share Based Compensation Arrangement By Share Based Payment Award Purchase Price Of Common Stock Percent ShareBasedCompensationArrangementByShareBasedPaymentAwardPurchasePriceOfCommonStockPercent	0.85
CY2010Q4	alk	Total Cash And Marketable Securities Amortized Cost Basis TotalCashAndMarketableSecuritiesAmortizedCostBasis	1195300000	USD
CY2011Q4	alk	Total Cash And Marketable Securities Amortized Cost Basis TotalCashAndMarketableSecuritiesAmortizedCostBasis	1131700000	USD
CY2011	dei	Amendment Flag AmendmentFlag	false
CY2011	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2011	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2011	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2011
CY2011	dei	Document Period End Date DocumentPeriodEndDate	2011-12-31
CY2011	dei	Document Type DocumentType	10-K
CY2011	dei	Entity Central Index Key EntityCentralIndexKey	0000766421
CY2012Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	35453202	shares
CY2011	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2011	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2011Q2	dei	Entity Public Float EntityPublicFloat	2500000000	USD
CY2011	dei	Entity Registrant Name EntityRegistrantName	ALASKA AIR GROUP INC
CY2011	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2011	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes

Files In Submission

Name	View Source	Status
0000766421-12-000018-index-headers.html	Edgar Link	pending
0000766421-12-000018-index.html	Edgar Link	pending
0000766421-12-000018.txt	Edgar Link	pending
0000766421-12-000018-xbrl.zip	Edgar Link	pending
alk-20111231.xml	Edgar Link	completed
alk-20111231.xsd	Edgar Link	pending
alk-20111231_cal.xml	Edgar Link	unprocessable
alk-20111231_def.xml	Edgar Link	unprocessable
alk-20111231_lab.xml	Edgar Link	unprocessable
alk-20111231_pre.xml	Edgar Link	unprocessable
alk10-k123111.htm	Edgar Link	pending
alk10-k123111ex21.htm	Edgar Link	pending
alk10-k123111ex231.htm	Edgar Link	pending
alk10-k123111ex311.htm	Edgar Link	pending
alk10-k123111ex312.htm	Edgar Link	pending
alk10-k123111ex321.htm	Edgar Link	pending
alk10-k123111ex322.htm	Edgar Link	pending
alk10k123111performancegraph.jpg	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xls	Edgar Link	pending
R1.htm	Edgar Link	pending
R10.htm	Edgar Link	pending
R11.htm	Edgar Link	pending
R12.htm	Edgar Link	pending
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R2.htm	Edgar Link	pending
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R3.htm	Edgar Link	pending
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$ALK
ALASKA AIR GROUP, INC. Stock $alk

2011 Q4 Form 10-K Financial Statement

#000076642112000018 Filed on February 21, 2012

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$ALK ALASKA AIR GROUP, INC. Stock $alk

2011 Q4 Form 10-K Financial Statement

#000076642112000018 Filed on February 21, 2012

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$ALK
ALASKA AIR GROUP, INC. Stock $alk