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Impact of the COVID-19 Pandemic (Details) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 22, 2019 | Jun. 30, 2020 aircraft | Dec. 31, 2020 USD ($) item aircraft $ / shares shares | Oct. 28, 2020 USD ($) | Sep. 30, 2020 USD ($) | Apr. 30, 2020 USD ($) | Dec. 31, 2019 USD ($)
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |
Liquid Assets |  |  | $ 1,530,400 |  |  |  |
Cash and Marketable Securities |  |  | 825,900 |  |  |  |
Line of credit facility, reduction of amount available |  |  | 39,500 |  |  |  |
Borrowed amount |  |  | $ 3,236,002 |  |  |  | $ 3,017,523
Interest rate (as a percent) | 6.85% |  |  |  |  |  |
COVID-19 |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |
Decrease in departures (as a percent) |  |  | 30.50% |  |  |  |
Decrease in block hours (as a percent) |  |  | 33.50% |  |  |  |
Maximum |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |
CARES Act, secured loans to airline industry |  |  | $ 25,000,000 |  |  |  |
PSP agreement |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |
Grants receivable |  |  | 450,700 |  | $ 450,700 | $ 438,000 |
Proceeds |  |  | $ 345,500 |  |  |  |
CRJ 200 | Sky West Airlines Inc |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |
Number of aircraft removed from service | aircraft |  |  | 55 |  |  |  |
CRJ 200 | Sky West Airlines Inc | American Prorate Agreement |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |
Number of aircraft removed from service | aircraft |  | 7 |  |  |  |  |
Grant | PSP agreement |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |
Principal amount |  |  | $ 345,500 |  |  |  |
Unsecured term loan | PSP agreement |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |
Principal amount |  |  | $ 105,200 |  |  |  |
Debt term |  |  | 10 years |  |  |  |
Unsecured term loan | First five years | PSP agreement |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 1.00% |  |  |  |
Unsecured term loan | Final five years | PSP agreement |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 2.00% |  |  |  |
Secured loan |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |
Borrowed amount |  |  | $ 60,000 |  |  |  |
Number of subsequent borrowings | item |  |  | 2 |  |  |  |
Interest rate (as a percent) |  |  | 3.22% |  |  |  |
Warrants to purchase shares | shares |  |  | 211,416 |  |  |  |
Warrants exercise price | $ / shares |  |  | $ 28.38 |  |  |  |
Warrant term |  |  | 5 years |  |  |  |
Maximum borrowing capacity |  |  |  | $ 725,000 | 573,000 |  |
Secured loan | COVID-19 |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |
Liquid Assets |  |  | $ 665,000 |  |  |  |
Secured loan | LIBOR |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 3.00% |  |  |  |
Secured loan |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |
Borrowed amount |  |  | $ 60,000 |  |  |  |
Number of subsequent borrowings | aircraft |  |  | 2 |  |  |  |
Warrants to purchase shares | shares |  |  | 211,416 |  |  |  |
Warrants exercise price | $ / shares |  |  | $ 28.38 |  |  |  |
Warrant term |  |  | 5 years |  |  |  |
Maximum borrowing capacity |  |  |  | $ 725,000 | $ 573,000 |  |
Warrant Shares | PSP agreement |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |
Warrants to purchase shares | shares |  |  | 370,720 |  |  |  |
Warrants exercise price | $ / shares |  |  | $ 28.38 |  |  |  |
Warrant term |  |  | 5 years |  |  |  |

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