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Nature of Operations and Summary of Significant Accounting Policies - Agreements (Details) | 12 Months Ended
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Dec. 31, 2018 aircraft | Dec. 31, 2016 item
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |
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 |
E 175 |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |
Number of aircraft held by entity | 146 |
ERJ 145 |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |
Number of aircraft held by entity | 105 |
Alaska |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |
Number of aircraft held by entity | 32 |
Alaska | E 175 |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |
Number of aircraft held by entity | 32 |
Delta |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |
Number of aircraft held by entity | 199 |
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 |
Delta Connection Agreement | Sky West Airlines Inc |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |
Term of agreement | 4 years 1 month 6 days |
United Express Agreements | Sky West Airlines Inc |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |
Term of agreement | 7 years |
American |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |
Number of aircraft held by entity | 75 |
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 |
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 | E 175 |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |
Number of aircraft held by entity | 146 |
Aircraft in scheduled service | ERJ 145 |  |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |  |
Number of aircraft held by entity | 100 |

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