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Nature of Operations and Summary of Significant Accounting Policies - Agreements (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 item | Dec. 31, 2018 aircraft | Dec. 31, 2017 agreement aircraft item
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |  |
Number of aircraft held by entity |  |  | 623
Number of seats on aircraft | item | 50 |  |
CRJ 200 |  |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |  |
Number of aircraft held by entity |  |  | 208
CRJ 700 |  |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |  |
Number of aircraft held by entity |  |  | 136
CRJ 700 | Forecast |  |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |  |
Number of aircraft removed from service |  | 8 |
CRJ 900 |  |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |  |
Number of aircraft held by entity |  |  | 52
CRJ 700s/900s |  |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |  |
Number of aircraft operated | agreement |  |  | 49
CRJ 700s/900s | Forecast |  |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |  |
Number of leased aircraft returned |  | 19 |
Number of aircraft removed from service |  | 30 |
E 175 |  |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |  |
Number of aircraft held by entity |  |  | 107
Number of seats on aircraft | item |  |  | 76
E 175 | Forecast |  |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |  |
Number of additional aircraft placed into service |  | 12 |
E175 SC |  |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |  |
Number of seats on aircraft | item |  |  | 70
E175 SC | Forecast |  |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |  |
Number of additional aircraft placed into service |  | 30 |
ERJ 135 |  |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |  |
Number of aircraft held by entity |  |  | 3
ERJ 145 |  |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |  |
Number of aircraft held by entity |  |  | 117
EMB 120 |  |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |  |
Number of aircraft removed from service |  |  | 11
Number of seats on aircraft | item |  |  | 30
Delta Connection Agreements | Sky West Airlines Inc |  |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |  |
Number of aircraft |  |  | 70
Delta Connection Agreements | CRJ 700 | ExpressJet |  |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |  |
Number of aircraft |  |  | 33
Delta Connection Agreements | CRJ 900 | Sky West Airlines Inc |  |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |  |
Number of aircraft |  |  | 36
Delta Connection Agreements | CRJ 900 | ExpressJet |  |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |  |
Number of aircraft |  |  | 16
Delta Connection Agreements | E 175 | Sky West Airlines Inc |  |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |  |
Number of aircraft |  |  | 19
Term of agreement |  |  | 2 years 10 months 24 days
Delta Connection Prorate Agreements | CRJ 200 | Sky West Airlines Inc |  |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |  |
Number of aircraft |  |  | 24
Term of agreement |  |  | 30 days
Delta Connection Prorate Agreements | CRJ 700 | Sky West Airlines Inc |  |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |  |
Number of aircraft |  |  | 27
United Express Agreements | CRJ 200 | Sky West Airlines Inc |  |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |  |
Number of aircraft |  |  | 57
United Express Agreements | CRJ 700 | Sky West Airlines Inc |  |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |  |
Number of aircraft |  |  | 20
United Express Agreements | E 175 | Sky West Airlines Inc |  |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |  |
Number of aircraft |  |  | 65
Term of agreement |  |  | 5 years 1 month 6 days
United ERJ Agreements | ERJ 135 | ExpressJet |  |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |  |
Number of aircraft |  |  | 3
Term of agreement |  |  | 4 years 9 months 18 days
United ERJ Agreements | ERJ 145 | ExpressJet |  |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |  |
Number of aircraft |  |  | 109
United Express Prorate Agreement | CRJ 200 | Sky West Airlines Inc |  |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |  |
Number of aircraft |  |  | 24
Term of agreement |  |  | 120 days
American Agreements | CRJ 200 | Sky West Airlines Inc |  |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |  |
Number of aircraft |  |  | 10
American Agreements | CRJ 700 | Sky West Airlines Inc |  |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |  |
Number of aircraft |  |  | 37
American Capacity Purchase Agreement | CRJ 700 | ExpressJet |  |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |  |
Number of aircraft |  |  | 12
American Prorate Agreement | CRJ 200 | Sky West Airlines Inc |  |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |  |
Number of aircraft |  |  | 6
Term of agreement |  |  | 120 days
Alaska Capacity Purchase Agreement | CRJ 200 | Sky West Airlines Inc |  |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |  |
Number of aircraft |  |  | 4
Alaska Capacity Purchase Agreement | E 175 | Sky West Airlines Inc |  |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |  |
Number of aircraft |  |  | 23
American |  |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |  |
Number of aircraft held by entity |  |  | 65
American | CRJ 200 |  |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |  |
Number of aircraft held by entity |  |  | 16
American | CRJ 700 |  |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |  |
Number of aircraft held by entity |  |  | 49
Aircraft in scheduled service |  |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |  |
Number of aircraft held by entity |  |  | 595
Aircraft in scheduled service | CRJ 200 |  |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |  |
Number of aircraft held by entity |  |  | 195
Aircraft in scheduled service | CRJ 700 |  |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |  |
Number of aircraft held by entity |  |  | 129
Aircraft in scheduled service | CRJ 900 |  |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |  |
Number of aircraft held by entity |  |  | 52
Aircraft in scheduled service | E 175 |  |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |  |
Number of aircraft held by entity |  |  | 107
Aircraft in scheduled service | ERJ 135 |  |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |  |
Number of aircraft held by entity |  |  | 3
Aircraft in scheduled service | ERJ 145 |  |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |  |
Number of aircraft held by entity |  |  | 109

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