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Income tax incurred and deferred: Movement (Details) - MXN ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Income tax: |  |
Beginning Balances | $ 3,165,145 | $ 3,004,584
IFRS 16 adoption adjustment Conversion revaluation effect Airplan and Aerostar | (24,241) | 65,777
Increase (decrease) in deferred tax liability (asset) | (96,272) | 94,784
Ending Balances | 3,044,632 | 3,165,145
Colombia (Airplan) |  |
Income tax: |  |
Increase (decrease) in deferred tax liability (asset) | (5,997) | (65,686)
Mexico |  |
Income tax: |  |
Increase (decrease) in deferred tax liability (asset) | (128,254) | 117,924
Puerto Rico (Aerostar) |  |
Income tax: |  |
Increase (decrease) in deferred tax liability (asset) | 37,979 | 42,546
Allowance for doubtful accounts [member] |  |
Income tax: |  |
Beginning Balances | (66,609) | (34,296)
Increase (decrease) in deferred tax liability (asset) | 8,647 | (32,313)
Ending Balances | (57,962) | (66,609)
Allowance for doubtful accounts [member] | Colombia (Airplan) |  |
Income tax: |  |
Increase (decrease) in deferred tax liability (asset) | 11,390 | (11,390)
Allowance for doubtful accounts [member] | Mexico |  |
Income tax: |  |
Increase (decrease) in deferred tax liability (asset) | (2,743) | (20,923)
Concessioned assets |  |
Income tax: |  |
Beginning Balances | 3,101,892 | 3,016,922
Increase (decrease) in deferred tax liability (asset) | (23,392) | 84,970
Ending Balances | 3,078,500 | 3,101,892
Concessioned assets | Colombia (Airplan) |  |
Income tax: |  |
Increase (decrease) in deferred tax liability (asset) | 28,642 | (73,994)
Concessioned assets | Mexico |  |
Income tax: |  |
Increase (decrease) in deferred tax liability (asset) | (91,743) | 115,197
Concessioned assets | Puerto Rico (Aerostar) |  |
Income tax: |  |
Increase (decrease) in deferred tax liability (asset) | 39,709 | 43,767
Unrealised foreign exchange gains (losses) |  |
Income tax: |  |
Beginning Balances | 96,740 | (42,814)
IFRS 16 adoption adjustment Conversion revaluation effect Airplan and Aerostar | (61,018) | 141,236
Increase (decrease) in deferred tax liability (asset) | (2,819) | (1,682)
Ending Balances | 32,903 | 96,740
Unrealised foreign exchange gains (losses) | Colombia (Airplan) |  |
Income tax: |  |
Increase (decrease) in deferred tax liability (asset) | (1,089) | (461)
Unrealised foreign exchange gains (losses) | Puerto Rico (Aerostar) |  |
Income tax: |  |
Increase (decrease) in deferred tax liability (asset) | (1,730) | (1,221)
Other temporary differences |  |
Income tax: |  |
Beginning Balances | 33,122 | 64,772
IFRS 16 adoption adjustment Conversion revaluation effect Airplan and Aerostar | 36,777 | (75,459)
Increase (decrease) in deferred tax liability (asset) | (78,708) | 43,809
Ending Balances | (8,809) | 33,122
Other temporary differences | Colombia (Airplan) |  |
Income tax: |  |
Increase (decrease) in deferred tax liability (asset) | (44,940) | 20,159
Other temporary differences | Mexico |  |
Income tax: |  |
Increase (decrease) in deferred tax liability (asset) | $ (33,768) | $ 23,650

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