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Income taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Deferred tax assets      
Flight equipment $ 12,681 $ 294,372  
Other intangibles 77,344 74,998  
Deferred losses on sale of assets 11,937 13,509  
Operating loss and tax credit carryforwards 2,086,080 1,839,825  
Other (22,206) (15,964)  
Total deferred tax assets 2,210,248 2,238,668  
Valuation allowance (70,812) (119,961) $ (11,000)
Deferred tax assets, net of valuation allowance 2,139,436 2,118,707  
Deferred tax liabilities      
Flight equipment (4,357,054) (4,023,650)  
Other intangibles (20,193) (22,927)  
Other (12,553) (55,894)  
Total deferred tax liabilities (4,389,800) (4,102,471)  
Total net deferred tax (liabilities) assets (2,250,364) (1,983,764)  
Ireland      
Deferred tax assets      
Flight equipment 8,690 289,860  
Other intangibles 0 0  
Deferred losses on sale of assets 0 0  
Operating loss and tax credit carryforwards 1,991,125 1,723,673  
Other (1,756) (8,608)  
Total deferred tax assets 2,001,571 2,022,141  
Valuation allowance (17,242) (16,285)  
Deferred tax assets, net of valuation allowance 1,984,329 2,005,856  
Deferred tax liabilities      
Flight equipment (4,274,880) (3,964,247)  
Other intangibles (20,193) (22,927)  
Other (6,325) (51,306)  
Total deferred tax liabilities (4,301,398) (4,038,480)  
Total net deferred tax (liabilities) assets (2,317,069) (2,032,624)  
Other      
Deferred tax assets      
Flight equipment 3,991 4,512  
Other intangibles 77,344 74,998  
Deferred losses on sale of assets 11,937 13,509  
Operating loss and tax credit carryforwards 94,955 116,152  
Other (20,450) (7,356)  
Total deferred tax assets 208,677 216,527  
Valuation allowance (53,570) (103,676)  
Deferred tax assets, net of valuation allowance 155,107 112,851  
Deferred tax liabilities      
Flight equipment (82,174) (59,403)  
Other intangibles 0 0  
Other (6,228) (4,588)  
Total deferred tax liabilities (88,402) (63,991)  
Total net deferred tax (liabilities) assets $ 66,705 $ 48,860