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Nature of Operations and Summary of Significant Accounting Policies - Long-Lived Assets (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 USD ($) aircraft | Dec. 31, 2022 USD ($) aircraft
Impairment of Long Lived and Intangible Assets |  |
Property and equipment and related assets | $ 5,482,967 | $ 5,548,480
Impairment loss of assets held for sale | 2,318 | $ 51,384
Number of aircraft held-for-sale | aircraft |  | 14
Impairment on assets held for sale | 2,318 | $ 51,384
Held for sale | CRJ 700 |  |
Impairment of Long Lived and Intangible Assets |  |
Impairment loss of assets held for sale | $ 2,300 | $ 51,400
Number of aircraft held-for-sale | aircraft | 14 | 14
Impairment on assets held for sale | $ 2,300 | $ 51,400

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