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Income taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Income Tax Disclosure [Line Items]      
Deferred tax liabilities, Flight equipment $ (3,367,369) $ (2,884,095)  
Deferred tax liabilities, intangibles (278,211) (397,938)  
Accrued maintenance liability (8,840) (19,994)  
Deferred tax liabilities, associated companies (3,973) (10,507)  
Obligations under capital leases and debt obligations   (180,378)  
Deferred tax assets, deferred losses on sale of assets 13,509 17,079  
Valuation allowance (119,961) (152,077) $ (79,393)
Deferred tax assets, losses and credits forward 2,002,892 1,841,023  
Deferred tax liabilities, other (221,811) (176,772)  
Net deferred income tax (liabilities) 1,983,764 1,963,659  
Ireland      
Income Tax Disclosure [Line Items]      
Deferred tax liabilities, Flight equipment (3,315,574) (3,091,396)  
Deferred tax liabilities, intangibles (295,480) (390,846)  
Accrued maintenance liability (11,451) (20,286)  
Obligations under capital leases and debt obligations   (2,079)  
Valuation allowance (16,285) (10,664)  
Deferred tax assets, losses and credits forward 1,828,473 1,726,510  
Deferred tax liabilities, other (222,308) (185,787)  
Net deferred income tax (liabilities) 2,032,625 1,974,548  
United States      
Income Tax Disclosure [Line Items]      
Deferred tax liabilities, Flight equipment (47,505)    
Deferred tax assets, flight equipment   214,404  
Deferred tax liabilities, intangibles   (7,092)  
Deferred tax assets, Intangibles 17,268    
Accrued maintenance liability 1,179 292  
Deferred tax liabilities, associated companies (3,973) (10,507)  
Obligations under capital leases and debt obligations   (178,299)  
Deferred tax assets, deferred losses on sale of assets 13,509 17,079  
Valuation allowance (87,509) (112,177)  
Deferred tax assets, losses and credits forward 140,970 87,199  
Deferred tax asset, other (109) (9,863)  
Net deferred income tax assets 34,048 20,762  
Other      
Income Tax Disclosure [Line Items]      
Deferred tax liabilities, Flight equipment (4,290) (7,103)  
Deferred tax assets, Intangibles 1    
Accrued maintenance liability 1,432    
Valuation allowance (16,167) (29,236)  
Deferred tax assets, losses and credits forward 33,449 27,314  
Deferred tax liabilities, other   (848)  
Deferred tax asset, other (388)    
Net deferred income tax (liabilities)   $ 9,873  
Net deferred income tax assets $ 14,813