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Assets Held for Sale (Details) - CRJ 700 - Held for sale $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2024 USD ($) aircraft | Dec. 31, 2022 aircraft | Dec. 31, 2023 USD ($)
Assets Held for Sale |  |  |
Number of aircraft held-for-sale | aircraft | 14 | 14 |
Gain due to elimination of the costs to sell in other operating expenses | $ 4.2 |  |
Assets held for sale |  |  | $ 54.3

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