CARES Act, Federal Tax Benefit

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CARES Act, Payroll Support Program, Grant

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CARES Act, Payroll Support Program, Total Payment

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CARES Act, Payroll Tax Deferral, Expected Liquidity, Remainder of Fiscal Year

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Employee Related Cost Reductions, Percentage, Salary Reduction , Officers - Low Range

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Employee Related Cost Reductions, Percentage, Salary Reduction, Officers - Upper Range

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Loyalty points, pre-purchase arrangement

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Number Of Aircraft Removed From Active Service

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Reduction in aircraft capital expenditures through 2022, relating to Airbus purchase agreement amendment

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Special Items - Fleet Impairment

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Exercise price per share or per unit of warrants or rights outstanding.

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Number of warrants or rights outstanding.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Period between issuance and maturity of long-term debt, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Period between issuance and expiration of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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The COVID-19 Pandemic (Details) $ / shares in Units, shares in Millions, $ in Millions	1 Months Ended	3 Months Ended
	May 08, 2020 USD ($) Rate	Mar. 31, 2020 USD ($) aircraft Rate	Mar. 31, 2019 USD ($) Rate	Apr. 23, 2020 USD ($) $ / shares Rate shares
Subsequent Event [Line Items]
Loyalty points, pre-purchase arrangement	$ 150.0
Class of Warrant or Right, Outstanding \| shares				2.6
Class of Warrant or Right, Exercise Price of Warrants or Rights \| $ / shares				$ 9.50
Warrants and Rights Outstanding, Term				5 years
CARES Act, Payroll Support Program, Grant	685.0
CARES Act, Payroll Support Program, Total Payment	936.0
CARES Act, Federal Tax Benefit		$ 12.1
Effective Income Tax Rate Reconciliation, Percent \| Rate		24.30%	28.30%
CARES Act, Payroll Tax Deferral, Expected Liquidity, Remainder of Fiscal Year	67.0
Reduction in aircraft capital expenditures through 2022, relating to Airbus purchase agreement amendment	$ (1,100.0)
Special Items - Fleet Impairment		$ 202.0	$ 0.0
Number Of Aircraft Removed From Active Service \| aircraft		170
Employee Related Cost Reductions, Percentage, Salary Reduction, Officers \| Rate		(20.00%)
Employee Related Cost Reductions, Percentage, Salary Reduction, Officers - Upper Range \| Rate		(50.00%)
Unsecured Debt [Member] \| US Department of Treasury [Member]
Subsequent Event [Line Items]
Debt Instrument, Face Amount				$ 251.0
Long-term Debt, Term				10 years
Debt Instrument, Interest Rate, Stated Percentage \| Rate				1.00%
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] \| Unsecured Debt [Member] \| US Department of Treasury [Member]
Subsequent Event [Line Items]
Debt Instrument, Basis Spread on Variable Rate \| Rate	2.00%