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Flying Agreements Revenue and Lease, Airport Services and Other Revenues - Flying Agreements (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2020 USD ($) aircraft | Mar. 31, 2019 USD ($) | Jun. 30, 2020 USD ($) aircraft | Dec. 31, 2020 USD ($) aircraft | Dec. 31, 2019 USD ($)
Agreements with other airlines |  |  |  |  |
Percentage of ASMs flown under fixed-fee arrangements | 85.90% |  |  |  |
Percentage of ASMs flown under pro-rate arrangements | 14.10% |  |  |  |
Revenues [Abstract] |  |  |  |  |
Operating revenues | $ 729,936 | $ 723,694 |  |  |
Rental income under operating leases |  |  |  |  |
Operating lease revenue | 10,546 | 9,058 |  |  |
Future minimum rental income |  |  |  |  |
April 2020 through December 2020 | 23,484 |  |  |  |
2021 | 27,849 |  |  |  |
2022 | 27,606 |  |  |  |
2023 | 24,704 |  |  |  |
2024 | 24,396 |  |  |  |
Thereafter | 87,235 |  |  |  |
Total | 215,274 |  |  |  |
Property and equipment and related assets | 5,393,738 |  |  |  | $ 5,394,681
Balance | 15,388 |  | $ 15,388 | $ 15,388 |
Additions to credit loss reserve | 3,756 |  |  |  |
Balance | $ 19,144 |  |  |  |
Sky West Airlines Inc | Delta Connection Prorate Agreement |  |  |  |  |
Future minimum rental income |  |  |  |  |
Number of aircraft | aircraft | 27 |  |  |  |
Agreement term | 30 days |  |  |  |
Sky West Airlines Inc | United Express Prorate Agreement |  |  |  |  |
Future minimum rental income |  |  |  |  |
Number of aircraft | aircraft | 31 |  |  |  |
Agreement term | 120 days |  |  |  |
Sky West Airlines Inc | American Prorate Agreement |  |  |  |  |
Future minimum rental income |  |  |  |  |
Number of aircraft | aircraft | 7 |  |  |  |
Agreement term | 120 days |  |  |  |
Third Party Lease |  |  |  |  |
Future minimum rental income |  |  |  |  |
Property and equipment and related assets | $ 154,100 |  |  |  |
CRJ 200 | Sky West Airlines Inc | Delta Connection Agreement |  |  |  |  |
Future minimum rental income |  |  |  |  |
Number of aircraft | aircraft | 55 |  |  |  |
Number of aircraft parked and stored | aircraft | 36 |  |  |  |
Additional depreciation | $ 15,000 |  |  |  |
Number of aircraft leased | aircraft | 19 |  |  |  |
CRJ 200 | Sky West Airlines Inc | United Express Agreements |  |  |  |  |
Future minimum rental income |  |  |  |  |
Number of aircraft | aircraft | 70 |  |  |  |
CRJ 200 | Sky West Airlines Inc | Forecast | Delta Connection Agreement |  |  |  |  |
Future minimum rental income |  |  |  |  |
Number of aircraft parked and stored | aircraft |  |  |  | 36 |
Additional depreciation |  |  |  | $ 29,100 |
CRJ 700 | American Capacity Purchase Agreement |  |  |  |  |
Future minimum rental income |  |  |  |  |
Number of aircraft | aircraft | 61 |  |  |  |
Number of aircraft to be placed in service | aircraft | 9 |  |  |  |
Total number of aircraft operated | aircraft | 70 |  |  |  |
CRJ 700 | Sky West Airlines Inc | Delta Connection Agreement |  |  |  |  |
Future minimum rental income |  |  |  |  |
Number of aircraft | aircraft | 8 |  |  |  |
CRJ 700 | Sky West Airlines Inc | United Express Agreements |  |  |  |  |
Future minimum rental income |  |  |  |  |
Number of aircraft | aircraft | 19 |  |  |  |
CRJ 900 | Sky West Airlines Inc | Delta Connection Agreement |  |  |  |  |
Future minimum rental income |  |  |  |  |
Number of aircraft | aircraft | 43 |  |  |  |
CRJ 900 | Sky West Airlines Inc | Delta Connection Prorate Agreement |  |  |  |  |
Future minimum rental income |  |  |  |  |
Number of aircraft to be placed in service | aircraft | 1 |  |  |  |
Agreement term | 9 years |  |  |  |
E175 | Sky West Airlines Inc | Delta Connection Agreement |  |  |  |  |
Future minimum rental income |  |  |  |  |
Number of aircraft | aircraft | 62 |  |  |  |
E175 | Sky West Airlines Inc | Delta Connection Prorate Agreement |  |  |  |  |
Future minimum rental income |  |  |  |  |
Number of aircraft to be placed in service | aircraft | 6 |  |  |  |
E175 | Sky West Airlines Inc | United Express Agreements |  |  |  |  |
Future minimum rental income |  |  |  |  |
Number of aircraft | aircraft | 69 |  |  |  |
E175 | Sky West Airlines Inc | American Prorate Agreement |  |  |  |  |
Future minimum rental income |  |  |  |  |
Number of aircraft to be placed in service | aircraft | 20 |  |  |  |
E175 | Sky West Airlines Inc | Forecast | Delta Connection Prorate Agreement |  |  |  |  |
Future minimum rental income |  |  |  |  |
Number of aircraft to be placed in service | aircraft |  |  | 3 |  |
Current assets |  |  |  |  |
Future minimum rental income |  |  |  |  |
Gross receivables current | $ 42,000 |  |  |  |
Other noncurrent assets |  |  |  |  |
Future minimum rental income |  |  |  |  |
Gross receivables Non-current | 76,700 |  |  |  |
Flying agreements |  |  |  |  |
Revenues [Abstract] |  |  |  |  |
Operating revenues | 709,494 | 700,001 |  |  |
Flight operations |  |  |  |  |
Revenues [Abstract] |  |  |  |  |
Operating revenues | 366,409 | 386,545 |  |  |
Aircraft lease |  |  |  |  |
Revenues [Abstract] |  |  |  |  |
Operating revenues | 242,734 | 207,381 |  |  |
Prorate agreements |  |  |  |  |
Revenues [Abstract] |  |  |  |  |
Operating revenues | 100,351 | 106,075 |  |  |
Airport customer service revenue |  |  |  |  |
Revenues [Abstract] |  |  |  |  |
Operating revenues | 9,896 | 14,635 |  |  |
Airport customer service and other |  |  |  |  |
Revenues [Abstract] |  |  |  |  |
Operating revenues | $ 20,442 | $ 23,693 |  |  |

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