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Description of the business and summary of significant accounting policies - Revenue recognition and financial instruments (Details)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Revenue recognition        
Discounts, payment incentives, bonuses or other variable considerations   $ 0    
Fare revenues $ 939,285 18,487,858 $ 17,791,317 $ 17,790,130
Other passenger revenues 400,982 7,892,497 6,098,504 4,919,452
Passenger revenues 1,340,267 26,380,355 23,889,821 22,709,582
Other non-passenger services 35,430 697,357 727,392 590,355
Cargo 11,555 227,438 170,973 171,623
Operating revenues 1,387,252 27,305,150 24,788,186 23,471,560
Transactions from unearned transportation revenues        
January 1,   2,293,309 2,228,051 1,957,254
Deferred   26,254,391 23,714,649 22,778,110
Recognized in revenue during the year   (26,109,184) (23,649,391) (22,507,313)
December 31,   2,438,516 2,293,309 2,228,051
Non-ticket revenues        
Cargo $ 11,555 227,438 170,973 171,623
Expected credit losses on accounts receivable   10,621 4,720 9,164
Domestic (Mexico)        
Revenue recognition        
Operating revenues   18,493,476 17,272,946 15,694,044
Domestic (Mexico) | At the flight time        
Revenue recognition        
Fare revenues   12,336,095 12,284,795 11,701,014
Other passenger revenues   5,182,572 4,087,664 3,238,826
Passenger revenues   17,518,667 16,372,459 14,939,840
Other non-passenger services   685,219 723,297 587,270
Cargo   221,324 165,907 166,934
Operating revenues   18,425,210 17,261,663 15,694,044
Non-ticket revenues        
Cargo   221,324 165,907 166,934
Domestic (Mexico) | At the sale        
Revenue recognition        
Other passenger revenues   68,264 11,283  
Passenger revenues   68,264 11,283  
Operating revenues   68,264 11,283  
International | At the flight time        
Revenue recognition        
Fare revenues   6,151,763 5,506,522 6,089,116
Other passenger revenues   2,598,375 1,992,696 1,680,626
Passenger revenues   8,750,138 7,499,218 7,769,742
Other non-passenger services   12,138 4,095 3,085
Cargo   6,114 5,066 4,689
Operating revenues   8,768,390 7,508,379 7,777,516
Non-ticket revenues        
Cargo   6,114 5,066 $ 4,689
International | At the sale        
Revenue recognition        
Other passenger revenues   43,286 6,861  
Passenger revenues   43,286 6,861  
Operating revenues   $ 43,286 $ 6,861  
Minimum        
Revenue recognition        
Term of trade receivables 1 day 1 day    
Maximum        
Revenue recognition        
Term of trade receivables 2 days 2 days