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COVID-19 COVID-19 (Details) - USD ($) $ / shares in Units, $ in Thousands | Sep. 30, 2021 | Apr. 23, 2021 | Dec. 27, 2020 | Dec. 24, 2020
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Unusual or Infrequent Item, or Both [Line Items] |  |  |  |
Total Proceeds To Be Provided to U.S. Airlines From Payroll Support Program Extension |  |  | $ 15,000,000 |
Payroll Support Program Grant Extension |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |
Total Proceeds from Payroll Support Program Grant | $ 91,800 |  |  |
Additional Proceeds Received from Payroll Support Program |  | $ 13,800 |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  | 924 |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  | $ 179.23
Debt Instrument, Face Amount |  | $ 1,700 |  |
Payroll Support Program 3 |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |
Total Proceeds from Payroll Support Program Grant | $ 98,400 |  |  |

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