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Flying Agreements and Airport Customer Service and Other Revenues (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) aircraft | Sep. 30, 2018 USD ($) | Dec. 31, 2019 aircraft | Sep. 30, 2019 USD ($) aircraft | Sep. 30, 2018 USD ($) | Dec. 31, 2016 item | Dec. 31, 2018 USD ($)
Agreements with other airlines |  |  |  |  |  |  |
Percentage of ASMs flown under fixed-fee arrangements |  |  |  | 82.10% |  |  |
Percentage of ASMs flown under pro-rate arrangements |  |  |  | 17.90% |  |  |
Revenues [Abstract] |  |  |  |  |  |  |
Operating revenues | $ | $ 760,295 | $ 829,275 |  | $ 2,228,372 | $ 2,418,190 |  |
future minimum rental income |  |  |  |  |  |  |
October 2019 through December 2019 | $ | 4,975 |  |  | 4,975 |  |  |
2020 | $ | 17,733 |  |  | 17,733 |  |  |
2021 | $ | 17,333 |  |  | 17,333 |  |  |
2022 | $ | 10,775 |  |  | 10,775 |  |  |
2023 | $ | 4,549 |  |  | 4,549 |  |  |
Thereafter | $ | 14,521 |  |  | 14,521 |  |  |
Total | $ | 69,886 |  |  | 69,886 |  |  |
Property and equipment and related assets | $ | 5,296,698 |  |  | $ 5,296,698 |  |  | $ 5,005,744
Sky West Airlines Inc | Delta Connection Prorate Agreement |  |  |  |  |  |  |
future minimum rental income |  |  |  |  |  |  |
Number of aircraft |  |  |  | 28 |  |  |
Term of agreement |  |  |  | 30 days |  |  |
Sky West Airlines Inc | United Express Prorate Agreement |  |  |  |  |  |  |
future minimum rental income |  |  |  |  |  |  |
Number of aircraft |  |  |  | 33 |  |  |
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 | $ | $ 76,700 |  |  | $ 76,700 |  |  |
CRJ 200 |  |  |  |  |  |  |
future minimum rental income |  |  |  |  |  |  |
Number of seats on aircraft | item |  |  |  |  |  | 50 |
CRJ 200 | American Prorate Agreement |  |  |  |  |  |  |
future minimum rental income |  |  |  |  |  |  |
Number of aircraft |  |  |  | 7 |  |  |
CRJ 200 | Sky West Airlines Inc | Delta Connection Agreement |  |  |  |  |  |  |
future minimum rental income |  |  |  |  |  |  |
Number of aircraft |  |  |  | 55 |  |  |
CRJ 200 | Sky West Airlines Inc | United Express Agreements |  |  |  |  |  |  |
future minimum rental income |  |  |  |  |  |  |
Number of aircraft |  |  |  | 67 |  |  |
CRJ 700 | American Capacity Purchase Agreement |  |  |  |  |  |  |
future minimum rental income |  |  |  |  |  |  |
Number of aircraft |  |  |  | 66 |  |  |
CRJ 700 | Sky West Airlines Inc | Delta Connection Agreement |  |  |  |  |  |  |
future minimum rental income |  |  |  |  |  |  |
Number of aircraft |  |  |  | 14 |  |  |
CRJ 700 | Sky West Airlines Inc | United Express Agreements |  |  |  |  |  |  |
future minimum rental income |  |  |  |  |  |  |
Number of aircraft |  |  |  | 19 |  |  |
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 | Sky West Airlines Inc | Delta Connection Agreement |  |  |  |  |  |  |
future minimum rental income |  |  |  |  |  |  |
Number of aircraft |  |  |  | 43 |  |  |
Number of aircrafts to be placed in service | 12 |  |  | 12 |  |  |
CRJ 900 | Sky West Airlines Inc | Delta Connection Agreement | Minimum |  |  |  |  |  |  |
future minimum rental income |  |  |  |  |  |  |
Number of aircraft |  |  |  | 13 |  |  |
E175 | Sky West Airlines Inc | Delta Connection Agreement |  |  |  |  |  |  |
future minimum rental income |  |  |  |  |  |  |
Number of aircraft |  |  |  | 54 |  |  |
Number of aircraft to be delivered in 2019 | 5 |  |  | 5 |  |  |
Number of aircraft to be delivered 2020 | 6 |  |  | 6 |  |  |
Number of additional aircraft placed into service |  |  |  | 11 |  |  |
Number of agreed additional aircrafts into service |  |  |  | 6 |  |  |
E175 | Sky West Airlines Inc | United Express Agreements |  |  |  |  |  |  |
future minimum rental income |  |  |  |  |  |  |
Number of aircraft |  |  |  | 65 |  |  |
Flying agreements |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |
Operating revenues | $ | $ 738,838 | 816,057 |  | $ 2,164,173 | 2,377,659 |  |
Flight operations |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |
Operating revenues | $ | 385,537 | 472,952 |  | 1,155,814 | 1,404,801 |  |
Aircraft lease |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |
Operating revenues | $ | 207,467 | 208,813 |  | 621,526 | 599,188 |  |
Prorate agreements |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |
Operating revenues | $ | $ 145,834 | $ 134,292 |  | $ 386,833 | $ 373,670 |  |

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