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Commitments and contingencies - Sale and lease back commitments (Details)
$ in Thousands
Apr. 29, 2021
$ / $
Dec. 31, 2020
$ / $
Dec. 31, 2020
Q / $
Dec. 31, 2020
₡ / $
Dec. 31, 2020
USD ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
$ / $
Dec. 31, 2019
Q / $
Dec. 31, 2019
₡ / $
Dec. 31, 2019
USD ($)
Dec. 31, 2018
$ / $
Dec. 31, 2018
Q / $
Dec. 31, 2018
₡ / $
Disclosure of maturity analysis of operating lease payments [line items]                          
Estimated proceeds from aircraft sale         $ 756,828,000 $ 15,097,735              
Non-cancellable sale and leaseback contracts of aircraft leases         $ 758,665,000 15,134,381              
Exchange rate 19.9785 19.9487 7.8095 615.7800 19.9487   18.8452 7.6988 573.4400 18.8452 19.6829 7.7440 609.6100
Within one year                          
Disclosure of maturity analysis of operating lease payments [line items]                          
Estimated proceeds from aircraft sale         $ 209,500,000 4,179,253              
Non-cancellable sale and leaseback contracts of aircraft leases         9,720,000 193,901              
Between one year and two years                          
Disclosure of maturity analysis of operating lease payments [line items]                          
Estimated proceeds from aircraft sale         547,328,000 10,918,482              
Non-cancellable sale and leaseback contracts of aircraft leases         47,972,000 956,979              
Between two and three years                          
Disclosure of maturity analysis of operating lease payments [line items]                          
Non-cancellable sale and leaseback contracts of aircraft leases         63,222,000 1,261,197              
Between three and four years                          
Disclosure of maturity analysis of operating lease payments [line items]                          
Non-cancellable sale and leaseback contracts of aircraft leases         63,222,000 1,261,197              
Later Than Four Years                          
Disclosure of maturity analysis of operating lease payments [line items]                          
Non-cancellable sale and leaseback contracts of aircraft leases         $ 574,529,000 $ 11,461,107