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Income tax - Analysis of deferred taxes (Details) $ in Thousands, $ in Thousands | 12 Months Ended |  |  |
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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 |  |  |  |

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