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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, 2020
USD ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Revenue recognition        
Discounts, payment incentives, bonuses or other variable considerations   $ 0    
Fare revenues $ 645,314 12,873,174 $ 23,129,991 $ 18,487,858
Other passenger revenues 431,777 8,613,398 10,569,208 7,892,497
Passenger revenues 1,077,091 21,486,572 33,699,199 26,380,355
Other non-passenger revenues (Note 1d) 44,231 882,360 897,586 697,357
Cargo 10,120 201,881 228,836 227,438
Total   22,570,813 34,825,621  
Non-derivatives financial instruments (20,614) (411,222) (72,949)  
Operating revenues $ 1,110,828 22,159,591 34,752,672 27,305,150
Transactions from unearned transportation revenues        
January 1,   3,679,926 2,438,516  
Deferred   23,657,563 34,940,609  
Recognized in revenue during the year   (21,486,572) (33,699,199)  
December 31,   5,850,917 3,679,926 2,438,516
Non-ticket revenues        
Expected credit losses on accounts receivable   13,664 40,393  
Revenue related to Vouchers reedemed by passengers   1,720,939    
Domestic (Mexico)        
Revenue recognition        
Operating revenues   16,572,198 24,594,797 18,493,476
Domestic (Mexico) | At the flight time        
Revenue recognition        
Fare revenues   8,455,647 15,833,878 12,336,095
Other passenger revenues   6,920,141 7,531,725 5,182,572
Passenger revenues   15,375,788 23,365,603 17,518,667
Other non-passenger revenues (Note 1d)   875,610 888,353 685,219
Cargo   196,349 221,375 221,324
Total   16,447,747 24,475,331  
Operating revenues       18,425,210
Domestic (Mexico) | At the sale        
Revenue recognition        
Other passenger revenues   124,450 119,466 68,264
Passenger revenues   124,450 119,466 68,264
Total   124,450 119,466  
Operating revenues       68,264
International | At the flight time        
Revenue recognition        
Fare revenues   4,417,527 7,296,113 6,151,763
Other passenger revenues   1,536,206 2,865,555 2,598,375
Passenger revenues   5,953,733 10,161,668 8,750,138
Other non-passenger revenues (Note 1d)   6,750 9,233 12,138
Cargo   5,532 7,461 6,114
Total   5,966,015 10,178,362  
Operating revenues       8,768,390
International | At the sale        
Revenue recognition        
Other passenger revenues   32,601 52,462 43,286
Passenger revenues   32,601 52,462 43,286
Total   $ 32,601 $ 52,462  
Operating revenues       $ 43,286
Minimum        
Revenue recognition        
Term of trade receivables 1 day 1 day    
Maximum        
Revenue recognition        
Term of trade receivables 2 days 2 days