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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, 2019
USD ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2017
MXN ($)
Revenue recognition        
Fare revenues $ 1,227,368 $ 23,129,991 $ 18,487,858 $ 17,791,317
Other passenger revenues 560,844 10,569,208 7,892,497 6,098,504
Passenger revenues 1,788,212 33,699,199 26,380,355 23,889,821
Other non-passenger revenues (Note 1d) 47,629 897,586 697,357 727,392
Cargo 12,143 228,836 227,438 170,973
Total   34,825,621    
Non-derivatives financial instruments (3,871) (72,949)    
Operating revenues $ 1,844,113 34,752,672 27,305,150 24,788,186
Transactions from unearned transportation revenues        
January 1,   2,438,516 2,293,309 2,228,051
Deferred   34,940,609 26,525,562 23,955,079
Recognized in revenue during the year   (33,699,199) (26,380,355) (23,889,821)
December 31,   3,679,926 2,438,516 2,293,309
Non-ticket revenues        
Expected credit losses on accounts receivable   40,393 10,621 4,720
Domestic (Mexico)        
Revenue recognition        
Operating revenues   24,594,797 18,493,476 17,272,946
Domestic (Mexico) | At the flight time        
Revenue recognition        
Fare revenues   15,833,878 12,336,095 12,284,795
Other passenger revenues   7,531,725 5,182,572 4,087,664
Passenger revenues   23,365,603 17,518,667 16,372,459
Other non-passenger revenues (Note 1d)   888,353 685,219 723,297
Cargo   221,375 221,324 165,907
Total   24,475,331    
Operating revenues     18,425,210 17,261,663
Domestic (Mexico) | At the sale        
Revenue recognition        
Other passenger revenues   119,466 68,264 11,283
Passenger revenues   119,466 68,264 11,283
Total   119,466    
Operating revenues     68,264 11,283
International | At the flight time        
Revenue recognition        
Fare revenues   7,296,113 6,151,763 5,506,522
Other passenger revenues   2,865,555 2,598,375 1,992,696
Passenger revenues   10,161,668 8,750,138 7,499,218
Other non-passenger revenues (Note 1d)   9,233 12,138 4,095
Cargo   7,461 6,114 5,066
Total   10,178,362    
Operating revenues     8,768,390 7,508,379
International | At the sale        
Revenue recognition        
Other passenger revenues   52,462 43,286 6,861
Passenger revenues   52,462 43,286 6,861
Total   $ 52,462    
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