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Leases - Carrying amounts of right-of use assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of quantitative information about right-of-use assets      
Balance at the beginning $ 2,180,931 $ 1,917,235  
Additions 404,717 553,331  
Extensions 73,586    
Modifications 41,173 30,808  
Depreciation on right of use assets (362,015) (320,443) $ (269,351)
Balance at the end 2,338,392 2,180,931 1,917,235
Aircraft leases      
Disclosure of quantitative information about right-of-use assets      
Balance at the beginning 2,110,753 1,862,664  
Additions 401,943 521,711  
Extensions 64,994    
Modifications 32,167 25,895  
Depreciation on right of use assets (337,694) (299,517)  
Balance at the end 2,272,163 2,110,753 1,862,664
Spare engine leases      
Disclosure of quantitative information about right-of-use assets      
Balance at the beginning 24,181 34,953  
Additions   1,023  
Extensions 7,825    
Modifications 9,006 (168)  
Depreciation on right of use assets (11,524) (11,627)  
Balance at the end 29,488 24,181 34,953
Building leases      
Disclosure of quantitative information about right-of-use assets      
Balance at the beginning 45,997 19,618  
Additions 2,774 30,597  
Extensions 767    
Modifications   5,081  
Depreciation on right of use assets (12,797) (9,299)  
Balance at the end $ 36,741 $ 45,997 $ 19,618