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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, 2022
USD ($)
aircraft
Dec. 31, 2021
USD ($)
aircraft
Dec. 31, 2011
aircraft
Dec. 31, 2020
USD ($)
Disclosure of maturity analysis of operating lease payments [line items]                  
Estimated proceeds from aircraft sale           $ 1,553,000      
Non-cancellable sale and leaseback contracts of aircraft leases           1,300,799      
Possible contingencies           $ 7,800 $ 8,000   $ 6,000
Airbus purchase agreement                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Number of aircraft purchased | aircraft           18 15    
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       20          
Not later than one year                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Estimated proceeds from aircraft sale           $ 165,500      
Non-cancellable sale and leaseback contracts of aircraft leases           7,977      
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           998,000      
Non-cancellable sale and leaseback contracts of aircraft leases           51,720      
Between two and three years                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Estimated proceeds from aircraft sale           389,500      
Non-cancellable sale and leaseback contracts of aircraft leases           104,014      
Between three and four years                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Non-cancellable sale and leaseback contracts of aircraft leases           108,400      
Later Than Four Years                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Non-cancellable sale and leaseback contracts of aircraft leases           $ 1,028,688