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Impact of the COVID-19 Pandemic (Details) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 27, 2020 USD ($) | Sep. 30, 2020 USD ($) $ / shares shares | Dec. 31, 2020 aircraft | Sep. 30, 2020 USD ($) $ / shares shares | Jun. 30, 2020 aircraft | Sep. 30, 2020 USD ($) aircraft item $ / shares shares | Oct. 28, 2020 USD ($) | Apr. 30, 2020 USD ($) | Dec. 31, 2019 USD ($)
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |
Liquid Assets |  | $ 1,374,800 |  | $ 1,374,800 |  | $ 1,374,800 |  |  |
Cash and Marketable Securities |  | 822,000 |  | 822,000 |  | 822,000 |  |  |
Line of credit facility, reduction of amount available |  | 39,800 |  | 39,800 |  | 39,800 |  |  |
Borrowed amount |  | 3,101,657 |  | 3,101,657 |  | 3,101,657 |  |  | $ 3,017,523
Maximum borrowing capacity |  | 75,000 |  | $ 75,000 |  | 75,000 |  |  |
COVID-19 |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |
Decrease in departures (as a percent) |  |  |  | 37.30% |  |  |  |  |
Decrease in block hours (as a percent) |  |  |  | 40.80% |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |
CARES Act, secured loans to airline industry | $ 25,000,000 |  |  |  |  | 25,000,000 |  |  |
PSP agreement |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |
Grants receivable |  | 450,700 |  | $ 450,700 |  | 450,700 |  | $ 438,000 |
Proceeds |  |  |  |  |  | 342,100 |  |  |
Deferred grant contra expenses |  | 3,400 |  | 3,400 |  | $ 3,400 |  |  |
CRJ 200 | Sky West Airlines Inc |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |
Number of aircraft removed from service | aircraft |  |  |  |  |  | 38 |  |  |
CRJ 200 | Sky West Airlines Inc | Delta Connection Agreement |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |
Number of aircraft | aircraft |  |  |  |  |  | 17 |  |  |
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 |  | 345,500 |  | $ 345,500 |  |  |
Forecast | CRJ 200 | Sky West Airlines Inc |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |
Number of aircraft anticipated to be removed | aircraft |  |  | 17 |  |  |  |  |  |
Unsecured term loan | PSP agreement |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |
Principal amount |  | $ 105,200 |  | $ 105,200 |  | $ 105,200 |  |  |
Debt term |  | 10 years |  | 10 years |  | 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 |  | $ 60,000 |  | $ 60,000 |  |  |
Number of subsequent borrowings | item |  |  |  |  |  | 2 |  |  |
Interest rate (as a percent) |  | 3.22% |  | 3.22% |  | 3.22% |  |  |
Warrants to purchase shares | shares |  | 211,416 |  | 211,416 |  | 211,416 |  |  |
Warrants exercise price | $ / shares |  | $ 28.38 |  | $ 28.38 |  | $ 28.38 |  |  |
Warrant term |  |  |  |  |  | 5 years |  |  |
Maximum borrowing capacity |  | $ 573,000 |  | $ 573,000 |  | $ 573,000 |  |  |
Secured loan | COVID-19 |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |
Liquid Assets |  | $ 513,000 |  | $ 513,000 |  | $ 513,000 |  |  |
Secured loan | Subsequent event |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | $ 725,000 |  |
Secured loan | LIBOR |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 3.00% |  |  |
Warrant Shares | PSP agreement |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |
Warrants to purchase shares | shares |  | 370,720 |  | 370,720 |  | 370,720 |  |  |
Warrants exercise price | $ / shares |  | $ 28.38 |  | $ 28.38 |  | $ 28.38 |  |  |
Warrant term |  | 5 years |  |  |  |  |  |  |

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