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Operating leases - Rental expense and sale and leaseback transactions (Details)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2011
MXN ($)
Operating leases          
Aircraft and engine $ 320,833 $ 6,314,930 $ 6,072,502 $ 5,590,058  
Airports facilities   56,288 44,251 40,591  
Offices, maintenance warehouse and hangar   36,483 30,544 33,517  
Total rental expenses on real estate   92,771 74,795 74,108  
Total cost of operating leases   6,407,701 6,147,297 5,664,166  
Gain on sale and leaseback transactions of aircraft and spare engines   609,168 65,886 484,827 $ (30,706)
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 3,047  
Non-current portion of loss on sale and leaseback transactions   8,366 11,413 14,460  
Amortized portion of loss on sale and leaseback transactions   $ 3,047 $ 3,047 $ 3,047