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Flying Agreements Revenue and Lease, Airport Services and Other Revenues - Flying Agreements (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Oct. 31, 2020 USD ($) aircraft | Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) aircraft | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($)
Agreements with other airlines |  |  |  |  |  |  |
Percentage of ASMs flown under fixed-fee arrangements |  |  |  |  | 87.20% | 82.10% |
Percentage of ASMs flown under pro-rate arrangements |  |  |  |  | 12.80% | 17.90% |
Revenues [Abstract] |  |  |  |  |  |  |
Operating revenues |  |  | $ 457,493 | $ 760,295 | $ 1,537,469 | $ 2,228,372 |
Rental income under operating leases |  |  |  |  |  |  |
Operating lease revenue |  |  | 7,136 | 10,075 | 27,162 | 28,113 |
Future minimum rental income |  |  |  |  |  |  |
October 2020 through December 2020 |  |  | 6,170 |  | 6,170 |  |
2021 |  |  | 24,780 |  | 24,780 |  |
2022 |  |  | 24,596 |  | 24,596 |  |
2023 |  |  | 21,643 |  | 21,643 |  |
2024 |  |  | 21,336 |  | 21,336 |  |
Thereafter |  |  | 70,938 |  | 70,938 |  |
Total |  |  | $ 169,463 |  | 169,463 |  |
Percentage of reduction in completed departures of flights |  |  | 37.00% |  |  |  |
Percentage of reduction in completed block hours of flights |  |  | 41.00% |  |  |  |
Deferred revenue |  |  | $ 98,600 |  | 98,600 |  |
Deferred revenue during the period |  |  | 29,600 |  |  |  |
Property and equipment and related assets |  |  | 5,207,746 |  | 5,207,746 |  | $ 5,394,681
Balance | $ 39,648 | $ 39,648 |  |  | 15,388 |  |
Additions to credit loss reserve |  |  |  |  | 24,260 |  |
Balance |  |  | 39,648 |  | $ 39,648 |  |
Sky West Airlines Inc | Delta Connection Prorate Agreement |  |  |  |  |  |  |
Future minimum rental income |  |  |  |  |  |  |
Number of aircraft | aircraft |  |  |  |  | 21 |  |
Agreement term |  |  |  |  | 30 days |  |
Sky West Airlines Inc | United Express Prorate Agreement |  |  |  |  |  |  |
Future minimum rental income |  |  |  |  |  |  |
Number of aircraft | aircraft |  |  |  |  | 26 |  |
Agreement term |  |  |  |  | 120 days |  |
Third Party Lease |  |  |  |  |  |  |
Future minimum rental income |  |  |  |  |  |  |
Property and equipment and related assets |  |  | 126,200 |  | $ 126,200 |  |
CRJ 200 | Sky West Airlines Inc | Delta Connection Agreement |  |  |  |  |  |  |
Future minimum rental income |  |  |  |  |  |  |
Number of aircraft | aircraft |  |  |  |  | 17 |  |
Number of aircrafts terminated | aircraft |  |  |  |  | 19 |  |
Number of aircraft parked and stored | aircraft |  |  |  |  | 17 |  |
Number of aircraft parked | aircraft |  |  |  |  | 19 |  |
Average age of aircraft |  |  |  |  | 18 years |  |
Depreciation expense |  |  | 20,200 |  |  |  |
CRJ 200 | Sky West Airlines Inc | United Express Agreements |  |  |  |  |  |  |
Future minimum rental income |  |  |  |  |  |  |
Number of aircraft | aircraft |  |  |  |  | 70 |  |
CRJ 200 | Sky West Airlines Inc | American Prorate Agreement |  |  |  |  |  |  |
Future minimum rental income |  |  |  |  |  |  |
Number of aircrafts terminated | aircraft |  |  |  |  | 7 |  |
CRJ 200 | Sky West Airlines Inc | Forecast | Delta Connection Agreement |  |  |  |  |  |  |
Future minimum rental income |  |  |  |  |  |  |
Depreciation expense |  | $ 8,500 |  |  |  |  |
CRJ 700 | American Capacity Purchase Agreement |  |  |  |  |  |  |
Future minimum rental income |  |  |  |  |  |  |
Number of aircraft | aircraft |  |  |  |  | 61 |  |
Number of aircraft to be placed by 2021 | aircraft | 29 |  |  |  |  |  |
Number of additional aircraft to be operated | aircraft | 20 |  |  |  |  |  |
Total number of aircraft operated | aircraft | 90 |  |  |  | 70 |  |
CRJ 700 | Sky West Airlines Inc | Delta Connection Agreement |  |  |  |  |  |  |
Future minimum rental income |  |  |  |  |  |  |
Number of aircraft | aircraft |  |  |  |  | 6 |  |
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 |  |  |  |  | 39 |  |
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 |  |  |  |  | 67 |  |
E175 | Sky West Airlines Inc | Delta Connection Prorate Agreement |  |  |  |  |  |  |
Future minimum rental income |  |  |  |  |  |  |
Number of aircraft to be placed in service | aircraft |  |  |  |  | 4 |  |
E175 | Sky West Airlines Inc | United Express Agreements |  |  |  |  |  |  |
Future minimum rental income |  |  |  |  |  |  |
Number of aircraft | aircraft |  |  |  |  | 90 |  |
E175 | Sky West Airlines Inc | American Prorate Agreement |  |  |  |  |  |  |
Future minimum rental income |  |  |  |  |  |  |
Number of aircraft to be placed in service | aircraft |  |  |  |  | 20 |  |
Current assets |  |  |  |  |  |  |
Future minimum rental income |  |  |  |  |  |  |
Gross receivables current |  |  | 49,000 |  | $ 49,000 |  |
Other noncurrent assets |  |  |  |  |  |  |
Future minimum rental income |  |  |  |  |  |  |
Gross receivables Non-current |  |  | 171,200 |  | 171,200 |  |
Flying agreements |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |
Operating revenues |  |  | 445,048 | 738,838 | 1,490,912 | 2,164,173 |
Rental income under operating leases |  |  |  |  |  |  |
Total operating revenues |  |  | 445,048 | 738,838 | 1,490,912 | 2,164,173 |
Flight operations |  |  |  |  |  |  |
Rental income under operating leases |  |  |  |  |  |  |
Total operating revenues |  |  | 175,753 | 385,537 | 674,222 | 1,155,814 |
Aircraft lease and fixed revenue |  |  |  |  |  |  |
Rental income under operating leases |  |  |  |  |  |  |
Total operating revenues |  |  | 208,516 | 207,467 | 619,354 | 621,526 |
Prorate agreements |  |  |  |  |  |  |
Rental income under operating leases |  |  |  |  |  |  |
Total operating revenues |  |  | 60,779 | 145,834 | 197,336 | 386,833 |
Lease, airport services and other |  |  |  |  |  |  |
Rental income under operating leases |  |  |  |  |  |  |
Total operating revenues |  |  | 12,445 | 21,457 | 46,557 | 64,199 |
Airport customer service and other |  |  |  |  |  |  |
Rental income under operating leases |  |  |  |  |  |  |
Total operating revenues |  |  | $ 5,309 | $ 11,382 | $ 19,395 | $ 36,086 |

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