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Description of the business and summary of significant accounting policies - Impact of new International Financial Reporting Standards (Details)
$ / shares in Units, $ / shares in Units, $ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
$ / shares
Dec. 31, 2019
MXN ($)
$ / shares
Dec. 31, 2018
MXN ($)
$ / shares
Dec. 31, 2017
MXN ($)
$ / shares
Dec. 31, 2019
MXN ($)
Dec. 31, 2016
MXN ($)
Impact of adoption on the consolidated statements of financial position            
Unearned transportation revenue $ 195,271   $ 2,438,516 $ 2,293,309 $ 3,679,926  
Retained earnings (losses) 23,264   (2,200,651) (1,257,769) 438,412  
Impact of adoption on the consolidated statements of operations            
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    
Operating revenues 1,844,113 34,752,672 27,305,150 24,788,186    
Operating income (loss) 231,115 4,355,423 534,797 1,242,704    
Net income (loss) $ 140,039 $ 2,639,063 $ (942,882) $ 278,671    
Earnings (loss) per share basic: | (per share) $ 0.138 $ 2.608 $ (0.932) $ 0.275    
Non-current assets:            
Right-of-use assets $ 1,811,006   $ 31,882,053 $ 24,893,882 34,128,766 $ 23,500,081
Deferred income tax     14,285,711 11,351,888 14,511,827  
Short-term liabilities:            
Lease liabilities     39,565,146 32,523,704 40,517,045 32,711,793
Lease liabilities 250,488   4,976,454 4,213,417 4,720,505  
Other liabilities (21,608)   (25,835) (202,250) (407,190)  
Long-term liabilities:            
Lease liabilities 1,899,504   34,588,692 28,310,287 35,796,540  
Other liabilities 77,982   1,820,194 1,454,790 1,469,595  
Equity:            
Retained earnings (losses) 23,264   (2,200,651) (1,257,769) $ 438,412  
Impact on the statement of operations            
Depreciation expense 249,558 $ 4,702,971 4,043,691 3,437,903    
Operating income 231,115 4,355,423 534,797 1,242,704    
Finance cost 120,446 2,269,829 1,876,312 1,515,281    
Foreign exchange (gain) loss (76,439) (1,440,501) 103,790 (683,039)    
Income tax expense (benefit) (58,096) (1,094,831) 349,820 (237,586)    
Net (income) loss (140,039) (2,639,063) 942,882 (278,671)    
Impact on the statement of cash flows            
Lease payments   (6,499,802) (5,710,907) (5,032,898)    
Net cash flows from operating activities 504,618 9,509,643 6,276,707 6,018,767    
Payment of principal portion of lease liabilities 344,905 6,499,802 5,710,907 5,032,898    
Net cash flows from financing activities $ (277,993) $ (5,238,840) (5,946,059) (3,634,598)    
Impact of IFRS 16 adoption            
Impact of adoption on the consolidated statements of financial position            
Retained earnings (losses)     (6,625,386) (6,419,554)   (7,365,758)
Impact of adoption on the consolidated statements of operations            
Operating income (loss)     (1,499,964) (1,369,475)    
Net income (loss)     (199,113) 1,011,921    
Non-current assets:            
Right-of-use assets     31,882,053 24,893,882   23,500,081
Deferred income tax     2,725,037 2,636,821   3,042,344
Prepaid expenses     (266,959) (266,959)   (266,959)
Short-term liabilities:            
Lease liabilities     4,976,454 4,213,417   4,237,065
Other liabilities     (91,889) (78,494)   (68,548)
Long-term liabilities:            
Lease liabilities     34,588,692 28,310,287   28,474,728
Other liabilities     1,492,260 1,238,088   997,979
Equity:            
Retained earnings (losses)     (6,625,386) (6,419,554)   $ (7,365,758)
Impact on the statement of operations            
Depreciation expense     4,043,691 3,437,903    
Lease benefit     (5,543,655) (4,807,378)    
Operating income     (1,499,964) (1,369,475)    
Finance cost     1,755,978 1,428,924    
Foreign exchange (gain) loss     31,315 (1,476,893)    
Income tax expense (benefit)     (88,216) 405,523    
Net (income) loss     199,113 (1,011,921)    
Impact on the statement of cash flows            
Lease payments     (5,710,907) (5,032,898)    
Net cash flows from operating activities     5,710,907 5,032,898    
Payment of principal portion of lease liabilities     5,710,907 5,032,898    
Net cash flows from financing activities     (5,710,907) (5,032,898)    
As previously reported            
Impact of adoption on the consolidated statements of operations            
Net income (loss)     (682,500) (594,599)    
Impact on the statement of operations            
Net (income) loss     $ 682,500 $ 594,599