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Nature of Operations and Summary of Significant Accounting Policies - Agreements (Details) - aircraft | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016
Agreements with other airlines |  |  |
Number of aircraft held by entity |  |  | 685
CRJ 200 |  |  |
Agreements with other airlines |  |  |
Number of aircraft held by entity |  |  | 215
Number of aircraft removed from service | 76 |  |
CRJ 200 | Forecast |  |  |
Agreements with other airlines |  |  |
Number of aircraft removed from service |  | 46 |
CRJ 200 | Sky West Airlines Inc |  |  |
Agreements with other airlines |  |  |
Number of aircraft under contract |  |  | 22
CRJ 700 |  |  |
Agreements with other airlines |  |  |
Number of aircraft held by entity |  |  | 139
CRJ 700 | Forecast |  |  |
Agreements with other airlines |  |  |
Number of aircraft operated in the existing fleet |  | 49 |
CRJ 900 |  |  |
Agreements with other airlines |  |  |
Number of aircraft held by entity |  |  | 64
E 175 |  |  |
Agreements with other airlines |  |  |
Number of aircraft held by entity |  |  | 86
ERJ 135 |  |  |
Agreements with other airlines |  |  |
Number of aircraft held by entity |  |  | 9
ERJ 145 |  |  |
Agreements with other airlines |  |  |
Number of aircraft held by entity |  |  | 158
ERJ 145 | Forecast |  |  |
Agreements with other airlines |  |  |
Number of aircraft removed from service |  | 45 |
EMB 120 |  |  |
Agreements with other airlines |  |  |
Number of aircraft held by entity |  |  | 14
ERJ145/135 | Forecast |  |  |
Agreements with other airlines |  |  |
Number of aircraft removed from service |  | 59 |
Delta Connection Agreements | Sky West Airlines Inc |  |  |
Agreements with other airlines |  |  |
Term of agreement |  |  | 3 years 8 months 12 days
Delta Connection Agreements | ExpressJet |  |  |
Agreements with other airlines |  |  |
Term of agreement |  |  | 2 years 9 months 18 days
Delta Connection Agreements | CRJ 200 | Sky West Airlines Inc |  |  |
Agreements with other airlines |  |  |
Number of aircraft under contract |  |  | 50
Delta Connection Agreements | CRJ 200 | ExpressJet |  |  |
Agreements with other airlines |  |  |
Number of aircraft under contract |  |  | 38
Delta Connection Agreements | CRJ 700 | Sky West Airlines Inc |  |  |
Agreements with other airlines |  |  |
Number of aircraft under contract |  |  | 27
Delta Connection Agreements | CRJ 700 | ExpressJet |  |  |
Agreements with other airlines |  |  |
Number of aircraft under contract |  |  | 35
Delta Connection Agreements | CRJ 900 | Sky West Airlines Inc |  |  |
Agreements with other airlines |  |  |
Number of aircraft under contract |  |  | 36
Delta Connection Agreements | CRJ 900 | ExpressJet |  |  |
Agreements with other airlines |  |  |
Number of aircraft under contract |  |  | 28
Delta Connection Agreements | E 175 | Forecast |  |  |
Agreements with other airlines |  |  |
Number of additional aircrafts into service |  | 6 |
Delta Connection Agreements | E 175 | Sky West Airlines Inc |  |  |
Agreements with other airlines |  |  |
Number of aircraft under contract |  |  | 13
Delta Connection Prorate Agreements | Sky West Airlines Inc |  |  |
Agreements with other airlines |  |  |
Term of agreement |  |  | 30 days
Delta Connection Prorate Agreements | CRJ 200 | Sky West Airlines Inc |  |  |
Agreements with other airlines |  |  |
Number of aircraft under contract |  |  | 21
United Express Agreements | Sky West Airlines Inc |  |  |
Agreements with other airlines |  |  |
Term of agreement |  |  | 5 years 8 months 12 days
United Express Agreements | CRJ 200 | Sky West Airlines Inc |  |  |
Agreements with other airlines |  |  |
Number of aircraft under contract |  |  | 53
United Express Agreements | CRJ 700 | Sky West Airlines Inc |  |  |
Agreements with other airlines |  |  |
Number of aircraft under contract |  |  | 35
United Express Agreements | E 175 | Forecast |  |  |
Agreements with other airlines |  |  |
Number of additional aircrafts into service |  | 7 |
United Express Agreements | E 175 | Sky West Airlines Inc |  |  |
Agreements with other airlines |  |  |
Number of aircraft under contract |  |  | 58
United ERJ Agreements | ExpressJet |  |  |
Agreements with other airlines |  |  |
Term of agreement |  |  | 10 months 24 days
United ERJ Agreements | ERJ 135 | ExpressJet |  |  |
Agreements with other airlines |  |  |
Number of aircraft under contract |  |  | 5
United ERJ Agreements | ERJ 145 | ExpressJet |  |  |
Agreements with other airlines |  |  |
Number of aircraft under contract |  |  | 140
United Express Prorate Agreement | Sky West Airlines Inc |  |  |
Agreements with other airlines |  |  |
Term of agreement |  |  | 120 days
American Capacity Purchase Agreement | CRJ 200 | Sky West Airlines Inc |  |  |
Agreements with other airlines |  |  |
Number of aircraft under contract |  |  | 9
American Capacity Purchase Agreement | CRJ 200 | ExpressJet |  |  |
Agreements with other airlines |  |  |
Number of aircraft under contract |  |  | 11
American Capacity Purchase Agreement | CRJ 700 | Sky West Airlines Inc |  |  |
Agreements with other airlines |  |  |
Number of aircraft under contract |  |  | 23
American Capacity Purchase Agreement | CRJ 700 | ExpressJet |  |  |
Agreements with other airlines |  |  |
Number of aircraft under contract |  |  | 10
American Capacity Purchase Agreement | ERJ 145 | ExpressJet |  |  |
Agreements with other airlines |  |  |
Number of aircraft under contract |  |  | 14
American Prorate Agreement | Sky West Airlines Inc |  |  |
Agreements with other airlines |  |  |
Term of agreement |  |  | 120 days
American Prorate Agreement | ExpressJet |  |  |
Agreements with other airlines |  |  |
Term of agreement |  |  | 120 days
American Prorate Agreement | CRJ 200 | Sky West Airlines Inc |  |  |
Agreements with other airlines |  |  |
Number of aircraft under contract |  |  | 6
American Prorate Agreement | CRJ 200 | ExpressJet |  |  |
Agreements with other airlines |  |  |
Number of aircraft under contract |  |  | 3
Alaska Capacity Purchase Agreement | E 175 | Forecast |  |  |
Agreements with other airlines |  |  |
Number of additional aircrafts into service |  | 5 |
Alaska Capacity Purchase Agreement | E 175 | Sky West Airlines Inc |  |  |
Agreements with other airlines |  |  |
Number of aircraft under contract |  |  | 15
American |  |  |
Agreements with other airlines |  |  |
Number of aircraft held by entity |  |  | 76
American | CRJ 200 |  |  |
Agreements with other airlines |  |  |
Number of aircraft held by entity |  |  | 29
American | CRJ 700 |  |  |
Agreements with other airlines |  |  |
Number of aircraft held by entity |  |  | 33
American | ERJ 145 |  |  |
Agreements with other airlines |  |  |
Number of aircraft held by entity |  |  | 14
Aircraft in scheduled service |  |  |
Agreements with other airlines |  |  |
Number of aircraft held by entity |  |  | 652
Aircraft in scheduled service | CRJ 200 |  |  |
Agreements with other airlines |  |  |
Number of aircraft held by entity |  |  | 213
Aircraft in scheduled service | CRJ 700 |  |  |
Agreements with other airlines |  |  |
Number of aircraft held by entity |  |  | 130
Aircraft in scheduled service | CRJ 900 |  |  |
Agreements with other airlines |  |  |
Number of aircraft held by entity |  |  | 64
Aircraft in scheduled service | E 175 |  |  |
Agreements with other airlines |  |  |
Number of aircraft held by entity |  |  | 86
Aircraft in scheduled service | ERJ 135 |  |  |
Agreements with other airlines |  |  |
Number of aircraft held by entity |  |  | 5
Aircraft in scheduled service | ERJ 145 |  |  |
Agreements with other airlines |  |  |
Number of aircraft held by entity |  |  | 154
Aircraft in scheduled service | ERJ145/135 |  |  |
Agreements with other airlines |  |  |
Number of aircraft held by entity |  |  | 159

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