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Income tax - Analysis of deferred taxes (Details)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2017
MXN ($)
Analysis of consolidated deferred taxes              
Net operating loss $ (231,115) $ (4,355,423) $ (534,797) $ (1,242,704)      
Deferred income tax assets         $ 14,511,827 $ 14,285,711 $ 11,351,888
Deferred income taxes         13,125,430 12,016,491 9,745,942
Deferred tax liability, net   1,386,397 2,269,220 1,605,946 1,386,397 2,269,220 1,605,946
Reflected in consolidated statement of financial position              
Deferred tax assets 81,853       1,542,536 3,392,240 3,222,228
Deferred tax liabilities $ (8,285)       (156,139) (1,123,020) (1,616,282)
Deferred tax liability, net   1,386,397 2,269,220 1,605,946 1,386,397 2,269,220 1,605,946
Reconciliation of deferred tax liability, net              
Deferred tax (liability) asset, net - beginning of the year   2,269,220 1,605,946 1,780,605      
Deferred income tax (expense) benefit during the current year recorded on profits   (811,061) 579,964 (187,209)      
Deferred income tax (expense) benefit during the current year recorded in accumulated other comprehensive income (loss)   (71,762) 83,310 12,550      
Deferred tax (liability) asset, net - end of the year   1,386,397 2,269,220 1,605,946      
Deferred tax assets              
Reconciliation of deferred tax liability, net              
Deferred income tax (expense) benefit during the current year recorded on profits   297,878 2,850,513 268,463      
Lease liabilities              
Analysis of consolidated deferred taxes              
Deferred income tax assets         12,155,114 11,841,977 9,733,555
Deferred income taxes       (59,235)      
Reconciliation of deferred tax liability, net              
Deferred income tax (expense) benefit during the current year recorded on profits   313,137 2,108,422        
Unearned transportation revenue              
Analysis of consolidated deferred taxes              
Deferred income tax assets         797,063 735,355 35,941
Reconciliation of deferred tax liability, net              
Deferred income tax (expense) benefit during the current year recorded on profits   61,708 699,414 (29,814)      
Extension lease agreement              
Analysis of consolidated deferred taxes              
Deferred income tax assets         459,343 596,982 514,562
Reconciliation of deferred tax liability, net              
Deferred income tax (expense) benefit during the current year recorded on profits   (137,639) 82,421 113,443      
Intangible              
Analysis of consolidated deferred taxes              
Deferred income tax assets         446,849 460,590 463,211
Reconciliation of deferred tax liability, net              
Deferred income tax (expense) benefit during the current year recorded on profits   (13,741) (2,621) (18,415)      
Provisions              
Analysis of consolidated deferred taxes              
Deferred income tax assets         351,345 290,690 294,865
Reconciliation of deferred tax liability, net              
Deferred income tax (expense) benefit during the current year recorded on profits   60,655 (4,175) (48,439)      
Tax losses available for offsetting against future taxable income              
Analysis of consolidated deferred taxes              
Deferred income tax assets         303,970 309,320 343,079
Reconciliation of deferred tax liability, net              
Deferred income tax (expense) benefit during the current year recorded on profits   (5,350) (33,759) 309,758      
Allowance for doubtful accounts              
Analysis of consolidated deferred taxes              
Deferred income tax assets         14,089 4,902 7,324
Reconciliation of deferred tax liability, net              
Deferred income tax (expense) benefit during the current year recorded on profits   9,187 (2,422) 433      
Employee benefits              
Analysis of consolidated deferred taxes              
Deferred income tax assets         11,463 5,446 5,786
Reconciliation of deferred tax liability, net              
Deferred income tax (expense) benefit during the current year recorded on profits   2,958 1,456 1,222      
Employee profit sharing              
Analysis of consolidated deferred taxes              
Deferred income tax assets         7,227 4,493 2,716
Reconciliation of deferred tax liability, net              
Deferred income tax (expense) benefit during the current year recorded on profits   2,734 1,777 (490)      
Non derivative financial instruments              
Analysis of consolidated deferred taxes              
Deferred income tax assets         4,229    
Reconciliation of deferred tax liability, net              
Deferred income tax (expense) benefit during the current year recorded on profits   4,229          
Financial instruments              
Analysis of consolidated deferred taxes              
Deferred income tax assets         38,865 35,956  
Deferred income taxes             49,151
Deferred tax liabilities              
Reconciliation of deferred tax liability, net              
Deferred income tax (expense) benefit during the current year recorded on profits   1,108,939 2,270,549 455,672      
Right of use asset              
Analysis of consolidated deferred taxes              
Deferred income taxes         10,236,929 9,564,618 7,468,160
Reconciliation of deferred tax liability, net              
Deferred income tax (expense) benefit during the current year recorded on profits   672,311 2,096,458 354,352      
Supplemental rent              
Analysis of consolidated deferred taxes              
Deferred income taxes         1,706,949 1,595,519 1,563,363
Reconciliation of deferred tax liability, net              
Deferred income tax (expense) benefit during the current year recorded on profits   111,430 32,156 223,753      
Rotable spare parts, furniture and equipment, net              
Analysis of consolidated deferred taxes              
Deferred income taxes         884,476 645,024 476,917
Reconciliation of deferred tax liability, net              
Deferred income tax (expense) benefit during the current year recorded on profits   239,452 168,107 108,890      
Prepaid expenses and other assets              
Analysis of consolidated deferred taxes              
Deferred income taxes         179,061 90,378 116,064
Reconciliation of deferred tax liability, net              
Deferred income tax (expense) benefit during the current year recorded on profits   88,683 (25,686) (239,586)      
Inventories              
Analysis of consolidated deferred taxes              
Deferred income taxes         90,287 88,895 88,169
Reconciliation of deferred tax liability, net              
Deferred income tax (expense) benefit during the current year recorded on profits   1,392 726 15,286      
Other prepayments              
Analysis of consolidated deferred taxes              
Deferred income taxes         27,728 32,057 33,269
Reconciliation of deferred tax liability, net              
Deferred income tax (expense) benefit during the current year recorded on profits   (4,329) (1,212) (7,023)      
Guatemala              
Analysis of consolidated deferred taxes              
Net operating loss   (1,085)          
Guatemala | Tax losses available for offsetting against future taxable income              
Analysis of consolidated deferred taxes              
Net operating loss     8,549        
Costa Rica              
Analysis of consolidated deferred taxes              
Deferred income tax assets         $ 0 $ 0 $ 0
Costa Rica | Tax losses available for offsetting against future taxable income              
Analysis of consolidated deferred taxes              
Net operating loss   50,246 $ 170,731 $ 300,613      
El Salvador              
Analysis of consolidated deferred taxes              
Net operating loss   $ 32,494