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Operating leases - Rental expense and sale and leaseback transactions (Details)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2015
MXN ($)
Dec. 31, 2011
MXN ($)
Operating leases          
Aircraft and engine $ 307,696 $ 6,072,502 $ 5,590,058 $ 3,525,336  
Airports facilities   44,251 40,591 39,993  
Offices, maintenance warehouse and hangar   30,544 33,517 25,889  
Total rental expenses on real estate   74,795 74,108 65,882  
Total cost of operating leases   6,147,297 5,664,166 3,591,218  
Gain on sale and leaseback transactions of aircraft and spare engines   65,886 484,827 181,736  
Deferred loss on sale and leaseback transactions of aircraft and spare engines         $ 30,706
Loss on sale and leaseback transactions to be amortized   3,047 3,047    
Non-current portion of loss on sale and leaseback transactions   11,413 14,460    
Amortized portion of loss on sale and leaseback transactions   $ 3,047 $ 3,047 $ 3,047