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Nature of Operations and Summary of Significant Accounting Policies - Flying Agreements and Airport Customer Service and Other Revenues (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 USD ($) aircraft | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) aircraft | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) item
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 | $ | $ 803,489 | $ 829,275 | $ 805,515 | $ 783,400 | $ 771,241 | $ 812,673 | $ 791,512 | $ 747,166 | $ 3,221,679 | $ 3,122,592 | [1] | $ 3,063,702 | [1]
Number of seats on aircraft | item |  |  |  |  |  |  |  |  |  |  |  | 50 |
Alaska Capacity Purchase Agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircraft |  |  |  |  |  |  |  |  | 32 |  |  |  |
Sky West Airlines Inc | Delta Connection Agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Term of agreement |  |  |  |  |  |  |  |  | 4 years 1 month 6 days |  |  |  |
Sky West Airlines Inc | Delta Connection Prorate Agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircraft |  |  |  |  |  |  |  |  | 29 |  |  |  |
Notice period for termination of agreement |  |  |  |  |  |  |  |  | 30 days |  |  |  |
Sky West Airlines Inc | United Express Agreements |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Term of agreement |  |  |  |  |  |  |  |  | 7 years |  |  |  |
Sky West Airlines Inc | United Express Prorate Agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircraft |  |  |  |  |  |  |  |  | 25 |  |  |  |
Notice period for termination of agreement |  |  |  |  |  |  |  |  | 120 days |  |  |  |
Sky West Airlines Inc | American Capacity Purchase Agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircraft |  |  |  |  |  |  |  |  | 58 |  |  |  |
Sky West Airlines Inc | American Prorate Agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Notice period for termination of agreement |  |  |  |  |  |  |  |  | 120 days |  |  |  |
ExpressJet |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Lease term (in years) | 5 years |  |  |  |  |  |  |  | 5 years |  |  |  |
Number of aircrafts to be leased |  |  |  |  |  |  |  |  | 16 |  |  |  |
CRJ 200 | Sky West Airlines Inc | Delta Connection Agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircraft |  |  |  |  |  |  |  |  | 58 |  |  |  |
CRJ 200 | Sky West Airlines Inc | United Express Agreements |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircraft |  |  |  |  |  |  |  |  | 65 |  |  |  |
CRJ 200 | Sky West Airlines Inc | American Prorate Agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircraft |  |  |  |  |  |  |  |  | 7 |  |  |  |
CRJ 200 | ExpressJet |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircraft ownership retained | 16 |  |  |  |  |  |  |  | 16 |  |  |  |
CRJ 200 | ExpressJet | United Express Agreements |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircraft |  |  |  |  |  |  |  |  | 16 |  |  |  |
CRJ 700 | Sky West Airlines Inc | Delta Connection Agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircraft |  |  |  |  |  |  |  |  | 22 |  |  |  |
CRJ 700 | Sky West Airlines Inc | United Express Agreements |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircraft |  |  |  |  |  |  |  |  | 19 |  |  |  |
CRJ 700 | ExpressJet |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircraft ownership retained | 10 |  |  |  |  |  |  |  | 10 |  |  |  |
CRJ 700 | ExpressJet | American Capacity Purchase Agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircraft |  |  |  |  |  |  |  |  | 10 |  |  |  |
CRJ 900 | Sky West Airlines Inc | Delta Connection Agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircraft |  |  |  |  |  |  |  |  | 41 |  |  |  |
E 175 | Sky West Airlines Inc | Delta Connection Agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircraft |  |  |  |  |  |  |  |  | 49 |  |  |  |
Number of aircrafts anticipated to place in service | 9 |  |  |  |  |  |  |  | 9 |  |  |  |
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 aircrafts anticipated to place in service | 3 |  |  |  |  |  |  |  | 3 |  |  |  |
ERJ 145 | ExpressJet | United Express Agreements |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircraft |  |  |  |  |  |  |  |  | 100 |  |  |  |
Flying agreements |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ |  |  |  |  |  |  |  |  | $ 3,169,520 | 3,078,297 | [1] | $ 3,010,738 | [1]
Flight operations |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ |  |  |  |  |  |  |  |  | 1,856,253 | 1,805,510 |  | 1,792,868 |
Aircraft lease |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ |  |  |  |  |  |  |  |  | 814,518 | 834,366 |  | 763,406 |
Prorate agreements |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ |  |  |  |  |  |  |  |  | $ 498,749 | $ 438,421 |  | $ 454,464 |
[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 of this report for additional information.

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