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Flying Agreements and Airport Customer Service and Other Revenues (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2019 USD ($) aircraft | Jun. 30, 2018 USD ($) aircraft | Dec. 31, 2019 aircraft | Jun. 30, 2019 USD ($) aircraft | Jun. 30, 2018 USD ($) | Dec. 31, 2016 item | Dec. 31, 2018 USD ($)
Agreements with other airlines |  |  |  |  |  |  |
Percentage of ASMs flown under fixed-fee arrangements |  |  |  | 83.10% |  |  |
Percentage of ASMs flown under pro-rate arrangements |  |  |  | 16.90% |  |  |
Revenues [Abstract] |  |  |  |  |  |  |
Operating revenues | $ | $ 744,383 | $ 805,515 |  | $ 1,468,077 | $ 1,588,915 |  |
future minimum rental income |  |  |  |  |  |  |
July 2019 through December 2019 | $ | 9,530 |  |  | 9,530 |  |  |
2020 | $ | 9,523 |  |  | 9,523 |  |  |
2021 | $ | 8,976 |  |  | 8,976 |  |  |
2022 | $ | 4,099 |  |  | 4,099 |  |  |
2023 | $ | 1,205 |  |  | 1,205 |  |  |
Thereafter | $ | 5,780 |  |  | 5,780 |  |  |
Total | $ | 39,113 |  |  | 39,113 |  |  |
Property and equipment and related assets | $ | 5,291,046 |  |  | $ 5,291,046 |  |  | $ 5,005,744
Sky West Airlines Inc | Delta Connection Prorate Agreement |  |  |  |  |  |  |
future minimum rental income |  |  |  |  |  |  |
Number of aircraft |  |  |  | 29 |  |  |
Term of agreement |  |  |  | 30 days |  |  |
Sky West Airlines Inc | United Express Prorate Agreement |  |  |  |  |  |  |
future minimum rental income |  |  |  |  |  |  |
Number of aircraft |  |  |  | 28 |  |  |
Term of agreement |  |  |  | 120 days |  |  |
Sky West Airlines Inc | American Prorate Agreement |  |  |  |  |  |  |
future minimum rental income |  |  |  |  |  |  |
Term of agreement |  |  |  | 120 days |  |  |
Third Party Lease |  |  |  |  |  |  |
future minimum rental income |  |  |  |  |  |  |
Property and equipment and related assets | $ | $ 35,600 |  |  | $ 35,600 |  |  |
CRJ 200 |  |  |  |  |  |  |
future minimum rental income |  |  |  |  |  |  |
Number of seats on aircraft | item |  |  |  |  |  | 50 |
CRJ 200 | Sky West Airlines Inc | Delta Connection Agreement |  |  |  |  |  |  |
future minimum rental income |  |  |  |  |  |  |
Number of aircraft |  |  |  | 57 |  |  |
CRJ 200 | Sky West Airlines Inc | United Express Agreements |  |  |  |  |  |  |
future minimum rental income |  |  |  |  |  |  |
Number of aircraft |  |  |  | 69 |  |  |
CRJ 200 | Sky West Airlines Inc | American Prorate Agreement |  |  |  |  |  |  |
future minimum rental income |  |  |  |  |  |  |
Number of aircraft |  |  |  | 7 |  |  |
CRJ 700 | Sky West Airlines Inc | Delta Connection Agreement |  |  |  |  |  |  |
future minimum rental income |  |  |  |  |  |  |
Number of aircraft |  |  |  | 16 |  |  |
CRJ 700 | Sky West Airlines Inc | United Express Agreements |  |  |  |  |  |  |
future minimum rental income |  |  |  |  |  |  |
Number of aircraft |  |  |  | 19 |  |  |
CRJ 700 | Sky West Airlines Inc | American Capacity Purchase Agreement |  |  |  |  |  |  |
future minimum rental income |  |  |  |  |  |  |
Number of aircraft |  |  |  | 64 |  |  |
CRJ 700 | American | Forecast |  |  |  |  |  |  |
future minimum rental income |  |  |  |  |  |  |
Number of aircraft |  |  | 10 |  |  |  |
Number of aircraft - acquired from third party |  |  | 7 |  |  |  |
Number of aircraft - internal source |  |  | 3 |  |  |  |
CRJ 900 | Delta Connection Agreement |  |  |  |  |  |  |
future minimum rental income |  |  |  |  |  |  |
Number of aircraft to be delivered in 2020 | 9 |  |  | 9 |  |  |
CRJ 900 | Sky West Airlines Inc | Delta Connection Agreement |  |  |  |  |  |  |
future minimum rental income |  |  |  |  |  |  |
Number of aircraft |  |  |  | 42 |  |  |
Number of additional aircraft placed into service |  |  |  | 11 |  |  |
CRJ 900 | Sky West Airlines Inc | Delta Connection Agreement | Minimum |  |  |  |  |  |  |
future minimum rental income |  |  |  |  |  |  |
Number of aircraft |  | 20 |  |  |  |  |
E 175 | Sky West Airlines Inc | Delta Connection Agreement |  |  |  |  |  |  |
future minimum rental income |  |  |  |  |  |  |
Number of aircraft |  |  |  | 54 |  |  |
Number of aircraft to be delivered in 2020 | 4 |  |  | 4 |  |  |
E 175 | Sky West Airlines Inc | United Express Agreements |  |  |  |  |  |  |
future minimum rental income |  |  |  |  |  |  |
Number of aircraft |  |  |  | 65 |  |  |
E 175 | Sky West Airlines Inc | Alaska Capacity Purchase Agreement |  |  |  |  |  |  |
future minimum rental income |  |  |  |  |  |  |
Number of aircraft |  |  |  | 32 |  |  |
Number of aircraft to be delivered 2021 | 3 |  |  | 3 |  |  |
Flying agreements |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |
Operating revenues | $ | $ 725,335 | $ 793,637 |  | $ 1,425,336 | 1,561,602 |  |
Flight operations |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |
Operating revenues | $ | 383,732 | 462,824 |  | 770,278 | 931,849 |  |
Aircraft lease |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |
Operating revenues | $ | 206,678 | 201,306 |  | 414,059 | 390,375 |  |
Prorate agreements |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |
Operating revenues | $ | $ 134,925 | $ 129,507 |  | $ 240,999 | $ 239,378 |  |

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