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Flying Agreements Revenue and Airport Customer Service and Other Revenue (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) aircraft item | Jun. 30, 2017 USD ($)
Agreements with other airlines |  |  |  |  |
Percentage of ASMs flown under fixed-fee arrangements |  |  |  | 84.70% |
Percentage of ASMs flown under pro-rate arrangements |  |  |  | 15.30% |
Revenues [Abstract] |  |  |  |  |
Operating revenues | $ | $ 805,515 | $ 791,512 | [1] | $ 1,588,915 | $ 1,538,678
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 Capacity Purchase Agreement |  |  |  |  |
Revenues [Abstract] |  |  |  |  |
Number of aircraft |  |  |  | 7 |
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 |  |  |  | 60 |
CRJ 200 | Sky West Airlines Inc | Delta Connection Prorate Agreement |  |  |  |  |
Revenues [Abstract] |  |  |  |  |
Number of aircraft |  |  |  | 34 |
CRJ 200 | Sky West Airlines Inc | United Express Agreements |  |  |  |  |
Revenues [Abstract] |  |  |  |  |
Number of aircraft |  |  |  | 64 |
CRJ 200 | Sky West Airlines Inc | United Express Prorate Agreement |  |  |  |  |
Revenues [Abstract] |  |  |  |  |
Number of aircraft |  |  |  | 21 |
CRJ 200 | Sky West Airlines Inc | American Capacity Purchase Agreement |  |  |  |  |
Revenues [Abstract] |  |  |  |  |
Number of aircraft |  |  |  | 10 |
CRJ 200 | Sky West Airlines Inc | American Prorate Agreement |  |  |  |  |
Revenues [Abstract] |  |  |  |  |
Number of aircraft |  |  |  | 7 |
CRJ 200 | Sky West Airlines Inc | Alaska Capacity Purchase Agreement |  |  |  |  |
Revenues [Abstract] |  |  |  |  |
Number of aircraft |  |  |  | 2 |
CRJ 200 | ExpressJet | American Capacity Purchase Agreement |  |  |  |  |
Revenues [Abstract] |  |  |  |  |
Number of aircraft |  |  |  | 16 |
CRJ 700 | Sky West Airlines Inc | Delta Connection Agreements |  |  |  |  |
Revenues [Abstract] |  |  |  |  |
Number of aircraft |  |  |  | 27 |
CRJ 700 | Sky West Airlines Inc | United Express Agreements |  |  |  |  |
Revenues [Abstract] |  |  |  |  |
Number of aircraft |  |  |  | 20 |
CRJ 700 | Sky West Airlines Inc | American Capacity Purchase Agreement |  |  |  |  |
Revenues [Abstract] |  |  |  |  |
Number of aircraft |  |  |  | 38 |
CRJ 700 | ExpressJet | Delta Connection Agreements |  |  |  |  |
Revenues [Abstract] |  |  |  |  |
Number of aircraft |  |  |  | 22 |
CRJ 700 | Delta |  |  |  |  |
Revenues [Abstract] |  |  |  |  |
Number of aircraft |  |  |  | 20 |
CRJ 700 | American |  |  |  |  |
Revenues [Abstract] |  |  |  |  |
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 |  |  |  | 36 |
CRJ 900 | Delta |  |  |  |  |
Revenues [Abstract] |  |  |  |  |
Number of additional aircraft placed into service |  |  |  | 20 |
E 175 |  |  |  |  |
Revenues [Abstract] |  |  |  |  |
Number of seats on aircraft | item |  |  |  | 76 |
E 175 | Sky West Airlines Inc | Delta Connection Agreements |  |  |  |  |
Revenues [Abstract] |  |  |  |  |
Number of aircraft |  |  |  | 32 |
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 |  |  |  | 29 |
E 175 | Alaska |  |  |  |  |
Revenues [Abstract] |  |  |  |  |
Number of additional aircraft placed into service |  |  |  | 6 |
Number of additional aircraft placed into service, deferred |  |  |  | 3 |
E 175 | Delta |  |  |  |  |
Revenues [Abstract] |  |  |  |  |
Number of additional aircraft placed into service |  |  |  | 17 |
E175 SC |  |  |  |  |
Revenues [Abstract] |  |  |  |  |
Number of seats on aircraft | item |  |  |  | 70 |
ERJ 145 | ExpressJet | United Express Agreements |  |  |  |  |
Revenues [Abstract] |  |  |  |  |
Number of aircraft |  |  |  | 97 |
ERJ 135 | ExpressJet | United Express Agreements |  |  |  |  |
Revenues [Abstract] |  |  |  |  |
Number of aircraft |  |  |  | 3 |
Flying agreements |  |  |  |  |
Revenues [Abstract] |  |  |  |  |
Operating revenues | $ | 793,637 | 781,724 | [1] | $ 1,561,602 | 1,516,253
Flight operations |  |  |  |  |
Revenues [Abstract] |  |  |  |  |
Operating revenues | $ | 462,824 | 459,350 |  | 931,849 | 905,069
Aircraft rentals |  |  |  |  |
Revenues [Abstract] |  |  |  |  |
Operating revenues | $ | 201,306 | 208,669 |  | 390,375 | 407,132
Prorate agreements |  |  |  |  |
Revenues [Abstract] |  |  |  |  |
Operating revenues | $ | $ 129,507 | $ 113,705 |  | $ 239,378 | $ 204,052
[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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