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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, 2018 item aircraft | Dec. 31, 2016 item
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |
Number of daily departures to different destinations | item | 2,770 |
Number of aircraft held by entity | 628 |
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 | 128 |
CRJ 900 |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |
Number of aircraft held by entity | 41 |
ERJ 145 |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |
Number of aircraft held by entity | 105 |
E 175 |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |
Number of aircraft held by entity | 146 |
United |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |
Number of aircraft held by entity | 290 |
Percentage of aggregate capacity operated | 48.60% |
United | CRJ 200 |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |
Number of aircraft held by entity | 106 |
United | CRJ 700 |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |
Number of aircraft held by entity | 19 |
United | ERJ 145 |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |
Number of aircraft held by entity | 100 |
United | E 175 |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |
Number of aircraft held by entity | 65 |
Delta |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |
Number of aircraft held by entity | 199 |
Percentage of aggregate capacity operated | 33.40% |
Delta | CRJ 200 |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |
Number of aircraft held by entity | 87 |
Delta | CRJ 700 |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |
Number of aircraft held by entity | 22 |
Delta | CRJ 900 |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |
Number of aircraft held by entity | 41 |
Delta | E 175 |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |
Number of aircraft held by entity | 49 |
American |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |
Number of aircraft held by entity | 75 |
Percentage of aggregate capacity operated | 12.60% |
American | CRJ 200 |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |
Number of aircraft held by entity | 7 |
American | CRJ 700 |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |
Number of aircraft held by entity | 68 |
Alaska |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |
Number of aircraft held by entity | 32 |
Percentage of aggregate capacity operated | 5.40% |
Alaska | E 175 |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |
Number of aircraft held by entity | 32 |
Aircraft in scheduled service |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |
Number of aircraft held by entity | 596 |
Aircraft in scheduled service | CRJ 200 |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |
Number of aircraft held by entity | 200 |
Aircraft in scheduled service | CRJ 700 |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |
Number of aircraft held by entity | 109 |
Aircraft in scheduled service | CRJ 900 |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |
Number of aircraft held by entity | 41 |
Aircraft in scheduled service | ERJ 145 |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |
Number of aircraft held by entity | 100 |
Aircraft in scheduled service | E 175 |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |
Number of aircraft held by entity | 146 |
Subleased to an un-affiliated entity |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |
Number of aircraft held by entity | 4 |
Subleased to an un-affiliated entity | CRJ 200 |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |
Number of aircraft held by entity | 4 |
Other |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |
Number of aircraft held by entity | 28 |
Other | CRJ 200 |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |
Number of aircraft held by entity | 4 |
Other | CRJ 700 |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |
Number of aircraft held by entity | 19 |
Other | ERJ 145 |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |
Number of aircraft held by entity | 5 |

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