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Operating leases - Future minimum rent payments (Details)
$ in Thousands, $ in Thousands
Apr. 25, 2018
$ / $
Dec. 31, 2017
$ / $
Dec. 31, 2017
Q / $
Dec. 31, 2017
₡ / $
Dec. 31, 2017
USD ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
$ / $
Dec. 31, 2016
Q / $
Dec. 31, 2016
₡ / $
Disclosure of maturity analysis of operating lease payments [line items]                  
Exchange rate 18.8628 19.7354 7.3448 572.5600     20.6640 7.5221 561.1000
Aircraft                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Future minimum payments         $ 1,837,388 $ 36,261,588      
Aircraft spare engines                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Future minimum payments         19,521 385,254      
Land and buildings | Denominated in U.S. dollars                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Future minimum payments         18,203 359,244      
Land and buildings | Denominated in Mexican pesos                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Future minimum payments           223,515      
Within one year | Aircraft                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Future minimum payments         257,681 5,085,438      
Within one year | Aircraft spare engines                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Future minimum payments         4,336 85,573      
Within one year | Land and buildings | Denominated in U.S. dollars                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Future minimum payments         6,718 132,582      
Within one year | Land and buildings | Denominated in Mexican pesos                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Future minimum payments           66,243      
Between one year and two years | Aircraft                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Future minimum payments         244,264 4,820,648      
Between one year and two years | Aircraft spare engines                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Future minimum payments         3,986 78,665      
Between one year and two years | Land and buildings | Denominated in U.S. dollars                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Future minimum payments         4,563 90,053      
Between one year and two years | Land and buildings | Denominated in Mexican pesos                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Future minimum payments           52,575      
Between two and three years | Aircraft                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Future minimum payments         238,837 4,713,544      
Between two and three years | Aircraft spare engines                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Future minimum payments         3,366 66,429      
Between two and three years | Land and buildings | Denominated in U.S. dollars                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Future minimum payments         4,548 89,757      
Between two and three years | Land and buildings | Denominated in Mexican pesos                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Future minimum payments           42,335      
Between three and four years | Aircraft                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Future minimum payments         233,002 4,598,388      
Between three and four years | Aircraft spare engines                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Future minimum payments         3,209 63,331      
Between three and four years | Land and buildings | Denominated in U.S. dollars                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Future minimum payments         1,672 32,998      
Between three and four years | Land and buildings | Denominated in Mexican pesos                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Future minimum payments           9,168      
Later than four years | Aircraft                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Future minimum payments         863,604 17,043,570      
Later than four years | Aircraft spare engines                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Future minimum payments         4,624 91,256      
Later than four years | Land and buildings | Denominated in U.S. dollars                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Future minimum payments         $ 702 13,854      
Later than four years | Land and buildings | Denominated in Mexican pesos                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Future minimum payments           $ 53,194