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Summary of Significant Accounting Policies - Aircraft Held for Sale (Details) $ in Thousands | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2025 USD ($) Aircraft | Dec. 31, 2024 USD ($) Aircraft | Dec. 31, 2023 Aircraft
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Aircraft held for sale | $ 23,449 | $ 66,986 |
Aircraft held for sale | $ 21,853 | $ 23,449 |
Number of aircrafts held for sale | Aircraft | 2 | 3 | 0
Disposal Group, Held-for-Sale, Not Discontinued Operations | Gulfstream GIV Aircrafts |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Aircraft held for sale | $ 11,871 | $ 0 |
Aircraft held for sale sold | (3,650) | (27,327) |
Aircraft reclassified to held for sale | 605 | 42,960 |
Impairment gain (loss) due to fair value adjustments | (197) | (3,762) |
Aircraft held for sale | $ 8,629 | $ 11,871 |

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