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Income tax (Details 3) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Deferred income tax assets:      
Total deferred income tax assets $ 1,125,047 $ 1,165,543  
Deferred income tax liabilities:      
Total deferred income tax liabilities 856,776 945,227  
Deferred taxes 268,271 220,316 $ 197,548
Lease liabilities [member]      
Deferred income tax assets:      
Total deferred income tax assets 871,608 899,011  
Unearned Transportation Revenue [Member]      
Deferred income tax assets:      
Total deferred income tax assets 14,440 13,392  
Aircraft And Engine Lease Return Obligation [Member]      
Deferred income tax assets:      
Total deferred income tax assets 98,933 86,696  
Unused tax losses [member]      
Deferred income tax assets:      
Total deferred income tax assets 234 39,360  
Intangible Tax Assets [Member]      
Deferred income tax assets:      
Total deferred income tax assets 23,190  
Allowance for credit losses [member]      
Deferred income tax assets:      
Total deferred income tax assets 431 411  
Other Financing Agreements [Member]      
Deferred income tax assets:      
Total deferred income tax assets 92,640 45,919  
Employee Benefits [Member]      
Deferred income tax assets:      
Total deferred income tax assets 4,256 4,220  
Employee Profit Sharing [Member]      
Deferred income tax assets:      
Total deferred income tax assets 8,195 375  
Financial Instruments Deferred Tax Assets [Member]      
Deferred income tax assets:      
Total deferred income tax assets 317 121  
Provisions [Member]      
Deferred income tax assets:      
Total deferred income tax assets 33,993 52,848  
Right-of-use assets [member]      
Deferred income tax liabilities:      
Total deferred income tax liabilities 659,190 735,092  
Deductible Supplemental Rent [Member]      
Deferred income tax liabilities:      
Total deferred income tax liabilities 59,844 72,521  
Rotable Spare Parts Furniture And Equipment Net [Member]      
Deferred income tax liabilities:      
Total deferred income tax liabilities 120,585 120,846  
Inventory [Member]      
Deferred income tax liabilities:      
Total deferred income tax liabilities 5,262 4,835  
Other Prepayment [Member]      
Deferred income tax liabilities:      
Total deferred income tax liabilities 2,981 2,602  
Prepaid Expenses And Other Assets [Member]      
Deferred income tax liabilities:      
Total deferred income tax liabilities $ 8,914 $ 9,331