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Commitments and contingencies - Sale and lease back commitments (Details)
$ in Thousands
 1 Months Ended 12 Months Ended
Oct. 10, 2022
aircraft
May 12, 2020
engine
Dec. 28, 2017
aircraft
Nov. 30, 2021
aircraft
Dec. 31, 2017
aircraft
Dec. 31, 2023
USD ($)
aircraft
Dec. 31, 2022
USD ($)
aircraft
Dec. 31, 2011
aircraft
Dec. 31, 2021
USD ($)
Disclosure of maturity analysis of operating lease payments [line items]                  
Estimated proceeds from aircraft sale           $ 1,447,500      
Non-cancellable sale and leaseback contracts of aircraft leases           1,162,429      
Possible contingencies related to legal matters           29,400 $ 2,800   $ 6,100
Possible contingencies related to other contributions matters           $ 20,500 $ 7,800   $ 8,000
Airbus purchase agreement                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Number of aircraft purchased | aircraft           13 18    
A320NEO model                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Number of aircraft purchased | aircraft         46     30  
A320NEO model | Airbus purchase agreement                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Number of aircraft purchased | aircraft 25   80 39          
A321NEO model                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Number of aircraft purchased   34     34        
A321NEO model | Airbus purchase agreement                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Number of aircraft converted | aircraft       19          
Not later than one year                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Estimated proceeds from aircraft sale           $ 626,500      
Non-cancellable sale and leaseback contracts of aircraft leases           19,440      
Later Than One Year And Not Later Than Two Years                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Estimated proceeds from aircraft sale           821,000      
Non-cancellable sale and leaseback contracts of aircraft leases           84,730      
Between two and three years                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Non-cancellable sale and leaseback contracts of aircraft leases           96,869      
Between three and four years                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Non-cancellable sale and leaseback contracts of aircraft leases           96,869      
Later Than Four Years                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Non-cancellable sale and leaseback contracts of aircraft leases           $ 864,521