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Income taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Deferred tax assets |  |
Flight equipment | $ 10,924 | $ 12,681
Other intangibles | 72,702 | 77,344
Deferred losses on sale of assets | 8,137 | 11,937
Operating loss and tax credit carryforwards | 1,821,502 | 2,086,080
Other | (17,388) | (22,206)
Total deferred tax assets | 1,930,653 | 2,210,248
Valuation allowance | (55,956) | (70,812)
Deferred tax assets, net of valuation allowance | 1,874,697 | 2,139,436
Deferred tax liabilities |  |
Flight equipment | (4,350,398) | (4,357,054)
Other intangibles | (17,458) | (20,193)
Other | (13,711) | (12,553)
Total deferred tax liabilities | (4,381,567) | (4,389,800)
Total net deferred tax (liabilities) assets | (2,506,870) | (2,250,364)
Ireland |  |
Deferred tax assets |  |
Flight equipment | 7,285 | 8,690
Other intangibles | 0 | 0
Deferred losses on sale of assets | 0 | 0
Operating loss and tax credit carryforwards | 1,713,394 | 1,991,125
Other | (1,332) | (1,756)
Total deferred tax assets | 1,722,011 | 2,001,571
Valuation allowance | (33,601) | (17,242)
Deferred tax assets, net of valuation allowance | 1,688,410 | 1,984,329
Deferred tax liabilities |  |
Flight equipment | (4,264,191) | (4,274,880)
Other intangibles | (17,458) | (20,193)
Other | (6,421) | (6,325)
Total deferred tax liabilities | (4,288,070) | (4,301,398)
Total net deferred tax (liabilities) assets | (2,599,660) | (2,317,069)
Other |  |
Deferred tax assets |  |
Flight equipment | 3,639 | 3,991
Other intangibles | 72,702 | 77,344
Deferred losses on sale of assets | 8,137 | 11,937
Operating loss and tax credit carryforwards | 108,108 | 94,955
Other | (16,056) | (20,450)
Total deferred tax assets | 208,642 | 208,677
Valuation allowance | (22,355) | (53,570)
Deferred tax assets, net of valuation allowance | 186,287 | 155,107
Deferred tax liabilities |  |
Flight equipment | (86,207) | (82,174)
Other intangibles | 0 | 0
Other | (7,290) | (6,228)
Total deferred tax liabilities | (93,497) | (88,402)
Total net deferred tax (liabilities) assets | $ 92,790 | $ 66,705

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