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Nature of Operations and Summary of Significant Accounting Policies - Aircraft Fleet (Details) | 12 Months Ended
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Dec. 31, 2016 item aircraft
Agreements with other airlines |
Number of daily departures to different destinations | item | 3,160
Number of aircraft held by entity | 685
CRJ 200 |
Agreements with other airlines |
Number of aircraft held by entity | 215
CRJ 700 |
Agreements with other airlines |
Number of aircraft held by entity | 139
CRJ 900 |
Agreements with other airlines |
Number of aircraft held by entity | 64
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
E 175 |
Agreements with other airlines |
Number of aircraft held by entity | 86
EMB 120 |
Agreements with other airlines |
Number of aircraft held by entity | 14
United |
Agreements with other airlines |
Number of aircraft held by entity | 313
Percentage of aggregate capacity operated | 52.20%
United | CRJ 200 |
Agreements with other airlines |
Number of aircraft held by entity | 75
United | CRJ 700 |
Agreements with other airlines |
Number of aircraft held by entity | 35
United | ERJ 135 |
Agreements with other airlines |
Number of aircraft held by entity | 5
United | ERJ 145 |
Agreements with other airlines |
Number of aircraft held by entity | 140
United | E 175 |
Agreements with other airlines |
Number of aircraft held by entity | 58
Delta |
Agreements with other airlines |
Number of aircraft held by entity | 248
Percentage of aggregate capacity operated | 36.50%
Delta | CRJ 200 |
Agreements with other airlines |
Number of aircraft held by entity | 109
Delta | CRJ 700 |
Agreements with other airlines |
Number of aircraft held by entity | 62
Delta | CRJ 900 |
Agreements with other airlines |
Number of aircraft held by entity | 64
Delta | E 175 |
Agreements with other airlines |
Number of aircraft held by entity | 13
American |
Agreements with other airlines |
Number of aircraft held by entity | 76
Percentage of aggregate capacity operated | 6.30%
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
Alaska |
Agreements with other airlines |
Number of aircraft held by entity | 15
Percentage of aggregate capacity operated | 5.00%
Alaska | E 175 |
Agreements with other airlines |
Number of aircraft held by entity | 15
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 | 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 | E 175 |
Agreements with other airlines |
Number of aircraft held by entity | 86
Subleased to an un-affiliated entity |
Agreements with other airlines |
Number of aircraft held by entity | 2
Subleased to an un-affiliated entity | CRJ 200 |
Agreements with other airlines |
Number of aircraft held by entity | 2
Other |
Agreements with other airlines |
Number of aircraft held by entity | 31
Other | CRJ 700 |
Agreements with other airlines |
Number of aircraft held by entity | 9
Other | ERJ 135 |
Agreements with other airlines |
Number of aircraft held by entity | 4
Other | ERJ 145 |
Agreements with other airlines |
Number of aircraft held by entity | 4
Other | EMB 120 |
Agreements with other airlines |
Number of aircraft held by entity | 14

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