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Flying Agreements Revenue and Airport Customer Service and Other Revenue (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 27 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) aircraft item | Sep. 30, 2017 USD ($) | Dec. 31, 2020 aircraft
Agreements with other airlines |  |  |  |  |  |
Percentage of ASMs flown under fixed-fee arrangements |  |  |  | 84.30% |  |
Percentage of ASMs flown under pro-rate arrangements |  |  |  | 15.70% |  |
Revenues [Abstract] |  |  |  |  |  |
Operating revenues | $ | $ 829,275 | $ 812,673 | [1] | $ 2,418,190 | $ 2,351,351 |
Sky West Airlines Inc | Delta Connection Prorate Agreement |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |
Term of agreement |  |  |  | 30 days |  |
Sky West Airlines Inc | United Express Prorate Agreement |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |
Term of agreement |  |  |  | 120 days |  |
Sky West Airlines Inc | American Prorate Agreement |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |
Term of agreement |  |  |  | 120 days |  |
CRJ 200 | Sky West Airlines Inc | Delta Connection Agreements |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |
Number of aircraft |  |  |  | 65 |  |
CRJ 200 | Sky West Airlines Inc | Delta Connection Prorate Agreement |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |
Number of aircraft |  |  |  | 29 |  |
CRJ 200 | Sky West Airlines Inc | United Express Agreements |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |
Number of aircraft |  |  |  | 61 |  |
CRJ 200 | Sky West Airlines Inc | United Express Prorate Agreement |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |
Number of aircraft |  |  |  | 23 |  |
CRJ 200 | Sky West Airlines Inc | American Prorate Agreement |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |
Number of aircraft |  |  |  | 7 |  |
CRJ 200 | ExpressJet |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |
Number of aircraft |  |  |  | 20 |  |
Term of agreement |  |  |  | 3 years |  |
CRJ 700 | Sky West Airlines Inc | Delta Connection Agreements |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |
Number of aircraft |  |  |  | 25 |  |
CRJ 700 | Sky West Airlines Inc | United Express Agreements |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |
Number of aircraft |  |  |  | 19 |  |
CRJ 700 | Sky West Airlines Inc | American Capacity Purchase Agreement |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |
Number of aircraft |  |  |  | 42 |  |
CRJ 700 | ExpressJet | Delta Connection Agreements |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |
Number of aircraft |  |  |  | 12 |  |
CRJ 700 | ExpressJet | Alaska Capacity Purchase Agreement |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |
Number of aircraft |  |  |  | 16 |  |
CRJ 700 | Delta |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |
Number of aircraft |  |  |  | 20 |  |
CRJ 700 | American |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |
Term of agreement |  |  |  | 4 years |  |
Number of additional aircraft placed into service |  |  |  | 20 |  |
CRJ 700 | United |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |
Number of aircraft |  |  |  | 19 |  |
CRJ 900 | Sky West Airlines Inc | Delta Connection Agreements |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |
Number of aircraft |  |  |  | 37 |  |
CRJ 900 | Delta | Forecast |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |
Number of additional aircraft placed into service |  |  |  |  |  | 20
E 175 | Minimum |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |
Number of seats on aircraft | item |  |  |  | 70 |  |
E 175 | Maximum |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |
Number of seats on aircraft | item |  |  |  | 76 |  |
E 175 | Sky West Airlines Inc | Delta Connection Agreements |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |
Number of aircraft |  |  |  | 41 |  |
E 175 | Sky West Airlines Inc | United Express Agreements |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |
Number of aircraft |  |  |  | 65 |  |
E 175 | Sky West Airlines Inc | Alaska Capacity Purchase Agreement |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |
Number of aircraft |  |  |  | 32 |  |
E 175 | Alaska |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |
Number of additional aircraft placed into service |  |  |  | 3 |  |
Number of additional aircraft placed into service, deferred |  |  |  | 3 |  |
E 175 | Delta |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |
Number of additional aircraft placed into service |  |  |  | 8 |  |
ERJ 145 | ExpressJet | United Express Agreements |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |
Number of aircraft |  |  |  | 100 |  |
Flying agreements |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |
Operating revenues | $ | 816,057 | 800,965 | [1] | $ 2,377,659 | 2,317,218 |
Flight operations |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |
Operating revenues | $ | 472,952 | 462,832 |  | 1,404,801 | 1,367,901 |
Aircraft rentals |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |
Operating revenues | $ | 208,813 | 213,967 |  | 599,188 | 621,099 |
Prorate agreements |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |
Operating revenues | $ | $ 134,292 | $ 124,166 |  | $ 373,670 | $ 328,218 |
[1] | Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.

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