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COVID-19 COVID-19 (Details) |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 20, 2020 USD ($) $ / shares shares | Apr. 30, 2020 Aircraft engine | Mar. 31, 2020 | Jun. 30, 2021 USD ($) | Apr. 09, 2020 $ / shares | Apr. 01, 2020 USD ($) | Feb. 13, 2020 USD ($) | Feb. 01, 2019 USD ($)
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | $ 545,500,000 | $ 450,000,000.0
Decrease in Revenue Compared to Prior Year |  |  | 36.00% |  |  |  |  |
Employee Related Cost Reductions, Percentage, Salary Reduction, Executive Officers |  |  | 50.00% |  |  |  |  |
Employee Related Cost Reductions, Number Of Employees Volunteering For Leave |  |  | 1,100 |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | $ 21,600,000 |  |  |  |  | $ 31,000,000.0 |  |
Flight Capacity Reduction |  |  |  |  |  | 87.40% |  |
Credit Voucher Term Expiration |  | 2 years |  |  |  |  |  |
Number Of Aircrafts Included As Collateral | Aircraft |  | 2 |  |  |  |  |  |
Total Expected Receipts of Relief Through Payroll Support Program of CARES Act | 171,900,000 |  |  |  |  |  |  |
Maximum Expected Proceeds From Payroll Support Program, Direct Grant From Treasury | 150,300,000 |  |  |  |  |  |  |
Maximum Expected Proceeds From Payroll Support Program, Low-Interest Loan | $ 21,600,000 |  |  |  |  |  |  |
Debt Instrument, Term | 10 years |  |  |  |  |  |  |
Total Amount Of Relief Granted Through Payroll Support Program Of CARES Act | $ 86,000,000.0 |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares | 25,898 |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares | $ 83.33 |  |  |  | $ 83.33 |  |  |
Expected Tax Refunds From CARES Act |  |  |  | $ 194,000,000.0 |  |  |  |
Total Expected Receipts of Relief through Loan Programs of CARES Act | $ 276,000,000.0 |  |  |  |  |  |  |
Asset, Aircraft, Unencumbered | Aircraft |  | 28 |  |  |  |  |  |
Asset, Engine, Unencumbered | engine |  | 8 |  |  |  |  |  |

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