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Income tax - Analysis of deferred taxes (Details)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Analysis of consolidated deferred taxes              
Net operating loss $ 163,099 $ 3,253,596 $ (4,355,423) $ (534,797)      
Deferred income tax assets         $ 15,768,220 $ 14,511,827  
Deferred income taxes         12,839,436 13,125,430  
Deferred tax liability, net   2,928,784 1,386,397 2,269,220 2,928,784 1,386,397 $ 2,269,220
Reflected in consolidated statement of financial position              
Deferred tax assets 156,830       3,128,555 1,542,536  
Deferred tax liabilities $ (10,014)       (199,771) (156,139)  
Deferred tax liability, net   2,928,784 1,386,397 2,269,220 2,928,784 1,386,397 2,269,220
Reconciliation of deferred tax liability, net              
Deferred tax (liability) asset, net - beginning of the year   1,386,397 2,269,220        
Deferred income tax (expense) benefit during the current year recorded on profits   1,494,758 (811,061)        
Deferred income tax (expense) benefit during the current year recorded in accumulated other comprehensive income (loss)   47,629 (71,762) 83,310      
Deferred tax (liability) asset, net - end of the year   2,928,784 1,386,397 2,269,220      
Temporary differences associated with investments in subsidiaries         150,683 276,393  
Deferred tax assets              
Reconciliation of deferred tax liability, net              
Deferred income tax (expense) benefit during the current year recorded on profits   1,208,764 297,878        
Lease liabilities              
Analysis of consolidated deferred taxes              
Deferred income tax assets         13,239,254 12,155,114  
Reconciliation of deferred tax liability, net              
Deferred income tax (expense) benefit during the current year recorded on profits   1,084,140 313,137        
Unearned transportation revenue              
Analysis of consolidated deferred taxes              
Deferred income tax assets         1,233,661 797,063  
Reconciliation of deferred tax liability, net              
Deferred income tax (expense) benefit during the current year recorded on profits   436,598 61,708        
Extension lease agreement              
Analysis of consolidated deferred taxes              
Deferred income tax assets         773,443 459,343  
Reconciliation of deferred tax liability, net              
Deferred income tax (expense) benefit during the current year recorded on profits   314,100 (137,639)        
Intangible              
Analysis of consolidated deferred taxes              
Deferred income tax assets         420,908 446,849  
Reconciliation of deferred tax liability, net              
Deferred income tax (expense) benefit during the current year recorded on profits   (25,941) (13,741)        
Allowance for doubtful accounts              
Analysis of consolidated deferred taxes              
Deferred income tax assets         61,565 14,089  
Reconciliation of deferred tax liability, net              
Deferred income tax (expense) benefit during the current year recorded on profits   47,476 9,187        
Tax losses available for offsetting against future taxable income              
Analysis of consolidated deferred taxes              
Deferred income tax assets         576,422 303,970 309,320
Reconciliation of deferred tax liability, net              
Deferred income tax (expense) benefit during the current year recorded on profits   272,452 (5,350)        
Employee benefits              
Analysis of consolidated deferred taxes              
Deferred income tax assets         15,191 11,463  
Reconciliation of deferred tax liability, net              
Deferred income tax (expense) benefit during the current year recorded on profits   2,934 2,958        
Financial instruments              
Analysis of consolidated deferred taxes              
Deferred income tax assets         7,948 38,865  
Reconciliation of deferred tax liability, net              
Deferred income tax (expense) benefit during the current year recorded on profits   (22)          
Employee profit sharing              
Analysis of consolidated deferred taxes              
Deferred income tax assets         4,323 7,227  
Reconciliation of deferred tax liability, net              
Deferred income tax (expense) benefit during the current year recorded on profits   (2,904) 2,734        
Provisions              
Analysis of consolidated deferred taxes              
Deferred income tax assets         91,253 351,345  
Reconciliation of deferred tax liability, net              
Deferred income tax (expense) benefit during the current year recorded on profits   (442,598) 60,655        
Non derivative financial instruments              
Analysis of consolidated deferred taxes              
Deferred income tax assets         473,242 4,229  
Reconciliation of deferred tax liability, net              
Deferred income tax (expense) benefit during the current year recorded on profits   (477,471) 4,229        
Deferred tax liabilities              
Reconciliation of deferred tax liability, net              
Deferred income tax (expense) benefit during the current year recorded on profits   (285,994) 1,108,939        
Right of use asset              
Analysis of consolidated deferred taxes              
Deferred income taxes         10,292,753 10,236,929  
Reconciliation of deferred tax liability, net              
Deferred income tax (expense) benefit during the current year recorded on profits   55,824 672,311        
Supplemental rent              
Analysis of consolidated deferred taxes              
Deferred income taxes         1,878,865 1,706,949  
Reconciliation of deferred tax liability, net              
Deferred income tax (expense) benefit during the current year recorded on profits   171,916 111,430        
Rotable spare parts, furniture and equipment, net              
Analysis of consolidated deferred taxes              
Deferred income taxes         707,092 884,476  
Reconciliation of deferred tax liability, net              
Deferred income tax (expense) benefit during the current year recorded on profits   (177,384) 239,452        
Inventories              
Analysis of consolidated deferred taxes              
Deferred income taxes         83,402 90,287  
Reconciliation of deferred tax liability, net              
Deferred income tax (expense) benefit during the current year recorded on profits   (6,885) 1,392        
Other prepayments              
Analysis of consolidated deferred taxes              
Deferred income taxes         9,786 27,728  
Reconciliation of deferred tax liability, net              
Deferred income tax (expense) benefit during the current year recorded on profits   (17,942) (4,329)        
Prepaid expenses and other assets              
Analysis of consolidated deferred taxes              
Deferred income taxes         132,462 179,061  
Reconciliation of deferred tax liability, net              
Deferred income tax (expense) benefit during the current year recorded on profits   (311,523) 88,683        
Guatemala              
Analysis of consolidated deferred taxes              
Net operating loss   (1,835) (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   55,751 50,246 $ 170,731      
El Salvador              
Analysis of consolidated deferred taxes              
Net operating loss   $ 16,619 $ 32,494