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Nature of Operations and Summary of Significant Accounting Policies - Flying Agreements (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) aircraft | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Agreements with other airlines |  |  |  |  |  |  |  |  |  |  |
Percentage of ASMs flown under fixed-fee arrangements |  |  |  |  |  |  |  |  | 87.00% |  |
Percentage of ASMs flown under pro-rate arrangements |  |  |  |  |  |  |  |  | 13.00% |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 589,638 | $ 457,493 | $ 350,039 | $ 729,936 | $ 743,591 | $ 760,295 | $ 744,383 | $ 723,694 | $ 2,127,106 | $ 2,971,963 | $ 3,221,679
Rental income under operating leases |  |  |  |  |  |  |  |  |  |  |
Operating lease revenue |  |  |  |  |  |  |  |  | 34,791 |  |
Operating lease income relating to lease payments |  |  |  |  |  |  |  |  |  | 27,552 | 3,923
Operating lease income relating to variable lease payments |  |  |  |  |  |  |  |  | 5,710 | 9,608 |
Future minimum rental income |  |  |  |  |  |  |  |  |  |  |
2021 | 43,573 |  |  |  |  |  |  |  | 43,573 |  |
2022 | 43,390 |  |  |  |  |  |  |  | 43,390 |  |
2023 | 42,837 |  |  |  |  |  |  |  | 42,837 |  |
2024 | 42,530 |  |  |  |  |  |  |  | 42,530 |  |
2025 | 39,082 |  |  |  |  |  |  |  | 39,082 |  |
Thereafter | 155,089 |  |  |  |  |  |  |  | 155,089 |  |
Total | 366,501 |  |  |  |  |  |  |  | 366,501 |  |
Property and equipment and related assets | 5,362,048 |  |  |  | 5,394,681 |  |  |  | 5,362,048 | 5,394,681 |
Deferred recognizing revenue |  |  |  |  |  |  |  |  | 110,728 |  |
Accounts receivable | 34,500 |  |  |  | 83,000 |  |  |  | 34,500 | 83,000 |
Gross receivables current | 56,100 |  |  |  |  |  |  |  | 56,100 |  |
Gross receivables Non-current | 157,400 |  |  |  |  |  |  |  | 157,400 |  |
Balance |  |  |  | $ 15,388 |  |  |  |  | 15,388 |  |
Additions to credit loss reserve |  |  |  |  |  |  |  |  | 30,837 |  |
Balance | 46,225 |  |  |  | 15,388 |  |  |  | $ 46,225 | 15,388 |
Sky West Airlines Inc | Delta Connection Agreement |  |  |  |  |  |  |  |  |  |  |
Future minimum rental income |  |  |  |  |  |  |  |  |  |  |
Agreement term |  |  |  |  |  |  |  |  | 5 years 8 months 12 days |  |
Sky West Airlines Inc | Delta Connection Prorate Agreement |  |  |  |  |  |  |  |  |  |  |
Future minimum rental income |  |  |  |  |  |  |  |  |  |  |
Notice period for termination of agreement |  |  |  |  |  |  |  |  | 30 days |  |
Sky West Airlines Inc | United Express Agreements |  |  |  |  |  |  |  |  |  |  |
Future minimum rental income |  |  |  |  |  |  |  |  |  |  |
Agreement term |  |  |  |  |  |  |  |  | 4 years 10 months 24 days |  |
Sky West Airlines Inc | United Express Prorate Agreement |  |  |  |  |  |  |  |  |  |  |
Future minimum rental income |  |  |  |  |  |  |  |  |  |  |
Notice period for termination of agreement |  |  |  |  |  |  |  |  | 120 days |  |
Third Party Lease |  |  |  |  |  |  |  |  |  |  |
Future minimum rental income |  |  |  |  |  |  |  |  |  |  |
Property and equipment and related assets | 271,100 |  |  |  |  |  |  |  | $ 271,100 |  |
CRJ 200 |  |  |  |  |  |  |  |  |  |  |
Future minimum rental income |  |  |  |  |  |  |  |  |  |  |
Number of seats on aircraft | aircraft |  |  |  |  |  |  |  |  | 50 |  |
CRJ 200 | Sky West Airlines Inc | Delta Connection Prorate Agreement |  |  |  |  |  |  |  |  |  |  |
Future minimum rental income |  |  |  |  |  |  |  |  |  |  |
Number of aircraft | aircraft |  |  |  |  |  |  |  |  | 26 |  |
CRJ 200 | Sky West Airlines Inc | United Express Agreements |  |  |  |  |  |  |  |  |  |  |
Future minimum rental income |  |  |  |  |  |  |  |  |  |  |
Number of aircraft | aircraft |  |  |  |  |  |  |  |  | 70 |  |
CRJ 200 | Sky West Airlines Inc | United Express Prorate Agreement |  |  |  |  |  |  |  |  |  |  |
Future minimum rental income |  |  |  |  |  |  |  |  |  |  |
Number of aircraft | aircraft |  |  |  |  |  |  |  |  | 34 |  |
CRJ 700 | Minimum |  |  |  |  |  |  |  |  |  |  |
Future minimum rental income |  |  |  |  |  |  |  |  |  |  |
Number of seats on aircraft | aircraft |  |  |  |  |  |  |  |  | 65 |  |
CRJ 700 | Maximum |  |  |  |  |  |  |  |  |  |  |
Future minimum rental income |  |  |  |  |  |  |  |  |  |  |
Number of seats on aircraft | aircraft |  |  |  |  |  |  |  |  | 76 |  |
CRJ 700 | American Capacity Purchase Agreement |  |  |  |  |  |  |  |  |  |  |
Future minimum rental income |  |  |  |  |  |  |  |  |  |  |
Number of aircraft | aircraft |  |  |  |  |  |  |  |  | 65 |  |
Agreement term |  |  |  |  |  |  |  |  | 3 years 3 months 18 days |  |
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 700 | American |  |  |  |  |  |  |  |  |  |  |
Future minimum rental income |  |  |  |  |  |  |  |  |  |  |
Number of aircraft | aircraft |  |  |  |  |  |  |  |  | 25 |  |
CRJ 900 | Minimum |  |  |  |  |  |  |  |  |  |  |
Future minimum rental income |  |  |  |  |  |  |  |  |  |  |
Number of seats on aircraft | aircraft |  |  |  |  |  |  |  |  | 65 |  |
CRJ 900 | Maximum |  |  |  |  |  |  |  |  |  |  |
Future minimum rental income |  |  |  |  |  |  |  |  |  |  |
Number of seats on aircraft | aircraft |  |  |  |  |  |  |  |  | 76 |  |
CRJ 900 | Sky West Airlines Inc | Delta Connection Agreement |  |  |  |  |  |  |  |  |  |  |
Future minimum rental income |  |  |  |  |  |  |  |  |  |  |
Number of aircraft | aircraft |  |  |  |  |  |  |  |  | 39 |  |
CRJ 900 | Delta |  |  |  |  |  |  |  |  |  |  |
Future minimum rental income |  |  |  |  |  |  |  |  |  |  |
Number of aircraft | aircraft |  |  |  |  |  |  |  |  | 1 |  |
E175 | Minimum |  |  |  |  |  |  |  |  |  |  |
Future minimum rental income |  |  |  |  |  |  |  |  |  |  |
Number of seats on aircraft | aircraft |  |  |  |  |  |  |  |  | 65 |  |
E175 | Maximum |  |  |  |  |  |  |  |  |  |  |
Future minimum rental income |  |  |  |  |  |  |  |  |  |  |
Number of seats on aircraft | aircraft |  |  |  |  |  |  |  |  | 76 |  |
E175 | Alaska Capacity Purchase Agreement |  |  |  |  |  |  |  |  |  |  |
Future minimum rental income |  |  |  |  |  |  |  |  |  |  |
Number of aircraft | aircraft |  |  |  |  |  |  |  |  | 32 |  |
Agreement term |  |  |  |  |  |  |  |  | 8 years 2 months 12 days |  |
E175 | Sky West Airlines Inc | Delta Connection Agreement |  |  |  |  |  |  |  |  |  |  |
Future minimum rental income |  |  |  |  |  |  |  |  |  |  |
Number of aircraft | aircraft |  |  |  |  |  |  |  |  | 71 |  |
E175 | Sky West Airlines Inc | United Express Agreements |  |  |  |  |  |  |  |  |  |  |
Future minimum rental income |  |  |  |  |  |  |  |  |  |  |
Number of aircraft | aircraft |  |  |  |  |  |  |  |  | 90 |  |
E175 | American |  |  |  |  |  |  |  |  |  |  |
Future minimum rental income |  |  |  |  |  |  |  |  |  |  |
Number of aircraft | aircraft |  |  |  |  |  |  |  |  | 20 |  |
Flying agreements |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | $ 2,060,801 | 2,889,265 | 3,169,520
Future minimum rental income |  |  |  |  |  |  |  |  |  |  |
Accounts receivable | $ 27,500 |  |  |  | $ 58,800 |  |  |  | 27,500 | 58,800 |
Flight operations |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 945,008 | 1,538,062 | 1,856,253
Aircraft lease and fixed revenue |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 846,933 | 830,247 | 814,518
Prorate agreements |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 268,860 | 520,956 | 498,749
Airport customer service and other revenue |  |  |  |  |  |  |  |  |  |  |
Rental income under operating leases |  |  |  |  |  |  |  |  |  |  |
Operating lease revenue |  |  |  |  |  |  |  |  | 25,804 | 45,538 | 48,236
Lease, airport services and other |  |  |  |  |  |  |  |  |  |  |
Rental income under operating leases |  |  |  |  |  |  |  |  |  |  |
Total operating lease income |  |  |  |  |  |  |  |  | $ 66,305 | $ 82,698 | $ 52,159

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