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The COVID-19 Pandemic Pandemic (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jul. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Apr. 23, 2020
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |
Change in Revenue, Percent |  |  | (90.00%) |  |  |  |  |
Change in Capacity, Percent |  |  | (85.00%) |  |  |  |  |
Parked Fleet, Temporary, Percent |  |  | 30.00% |  |  | 30.00% |  |
Employee Related Cost Reductions, Percentage, Salary Reduction, Officers |  |  |  |  |  | (20.00%) |  |
Employee Related Cost Reductions, Percentage, Salary Reduction, Officers - Upper Range |  |  |  |  |  | (50.00%) |  |
Cash, Cash Equivalents, Short-Term Investments, and Short-Term Restricted Cash |  |  | $ 3,400.0 |  |  | $ 3,400.0 |  |
Loyalty points, pre-purchase arrangement |  |  |  |  |  | 150.0 |  |
Reduction in aircraft capital expenditures through 2022, relating to Airbus purchase agreement amendment |  |  |  |  |  | (1,100.0) |  |
Cash, Cash Equivalents, and Short-Term Restricted Cash |  |  | 3,100.0 |  |  | 3,100.0 |  |
Proceeds from Sale Leaseback Transactions | $ 267.0 |  |  |  |  | 118.0 | $ 0.0 |
Special Items - Fleet Impairment |  |  | 0.0 | $ 202.0 | $ 0.0 | 202.0 | $ 0.0 |
CARES Act, Payroll Support Program, Total Payment |  |  |  |  |  |  |  | $ 936.0
CARES Act, Payroll Support Program, Grant |  |  | 667.0 |  |  | 667.0 |  | $ 685.0
Restricted Cash, Current |  |  | 533.0 |  |  | 533.0 |  |
Warrants and Rights Outstanding |  |  | 18.0 |  |  | 18.0 |  |
Class of Warrant or Right, Outstanding |  |  |  |  |  |  |  | 2.6
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  |  |  |  |  | $ 9.50
Warrants and Rights Outstanding, Term |  |  |  |  |  |  |  | 5 years
CARES Act, Secured Loans, Expected Eligibility Amount |  |  | $ 1,100.0 |  |  | $ 1,100.0 |  |
CARES Act, Class of Warrant or Right, Expected |  |  | 12.0 |  |  | 12.0 |  |
CARES Act, Payroll Tax Deferral |  |  |  |  |  | $ 20.0 |  |
CARES Act, Payroll Tax Deferral, Expected Liquidity, Remainder of Fiscal Year |  |  |  |  |  | 31.0 |  |
CARES Act, Federal Tax Benefit, Foreign Tax Credit Valuation Allowance |  |  |  |  |  | 10.0 |  |
CARES Act, Federal Tax Benefit, NOL Carryback |  |  |  |  |  | $ 35.0 |  |
Forecast [Member] |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |
Change in Capacity, Percent |  | (45.00%) |  |  |  |  |  |

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