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Income tax - Analysis of deferred taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Analysis of consolidated deferred taxes      
Net operating gain (loss) $ (222,710) $ (43,689) $ (397,030)
Deferred income tax assets 1,165,543 966,420  
Deferred income tax liabilities 945,227 768,872  
Deferred tax liability, net 220,316 197,548 130,081
Reflected in consolidated statement of financial position      
Deferred tax assets 236,026 208,010  
Deferred tax liabilities (15,710) (10,462)  
Deferred tax liability, net 220,316 197,548 130,081
Reconciliation of deferred tax liability, net      
Deferred tax (liability) asset, net - beginning of the year 197,548 130,081  
Deferred income tax (expense) benefit during the current year recorded on profits 22,316 67,595  
Deferred income tax (expense) benefit during the current year recorded in accumulated other comprehensive income (loss) 394 (159) (136)
Deferred income tax (expense) benefit for conversion purposes 58 31  
Deferred tax (liability) asset, net - end of the year 220,316 197,548 130,081
Lease liabilities      
Analysis of consolidated deferred taxes      
Deferred income tax assets 899,011 755,855  
Unearned transportation revenue      
Analysis of consolidated deferred taxes      
Deferred income tax assets 13,392 58,010  
Aircraft and engine lease return obligation      
Analysis of consolidated deferred taxes      
Deferred income tax assets 86,696 77,007  
Tax losses available for offsetting against future taxable income      
Analysis of consolidated deferred taxes      
Deferred income tax assets 39,360 38,387  
Reconciliation of deferred tax liability, net      
Deferred tax asset on tax losses 39,360 38,387  
Intangible      
Analysis of consolidated deferred taxes      
Deferred income tax assets 23,190 29,687  
Allowance for doubtful accounts      
Analysis of consolidated deferred taxes      
Deferred income tax assets 411 4,854  
Other financing agreements      
Analysis of consolidated deferred taxes      
Deferred income tax assets 45,919    
Employee benefits      
Analysis of consolidated deferred taxes      
Deferred income tax assets 4,220 2,486  
Employee profit sharing      
Analysis of consolidated deferred taxes      
Deferred income tax assets 375 134  
Derivative Financial instruments      
Analysis of consolidated deferred taxes      
Deferred income tax assets 121    
Provisions.      
Analysis of consolidated deferred taxes      
Deferred income tax assets 52,848    
Right of use asset      
Analysis of consolidated deferred taxes      
Deferred income tax liabilities 735,092 571,521  
Supplemental rent      
Analysis of consolidated deferred taxes      
Deferred income tax liabilities 72,521 55,479  
Rotable spare parts, furniture and equipment, net      
Analysis of consolidated deferred taxes      
Deferred income tax liabilities 120,846 120,561  
Provisions      
Analysis of consolidated deferred taxes      
Deferred income tax liabilities   7,345  
Inventories.      
Analysis of consolidated deferred taxes      
Deferred income tax liabilities 4,835 4,594  
Other prepayments      
Analysis of consolidated deferred taxes      
Deferred income tax liabilities 2,602 376  
Derivative Financial instruments      
Analysis of consolidated deferred taxes      
Deferred income tax liabilities   33  
Prepaid expenses and other assets      
Analysis of consolidated deferred taxes      
Deferred income tax liabilities 9,331 8,963  
Guatemala      
Analysis of consolidated deferred taxes      
Net operating gain (loss) 623 (10) (32)
Costa Rica      
Analysis of consolidated deferred taxes      
Deferred income tax assets 0   0
Costa Rica | Tax losses available for offsetting against future taxable income      
Analysis of consolidated deferred taxes      
Net operating gain (loss) (9,503) 3,869 5,947
El Salvador      
Analysis of consolidated deferred taxes      
Net operating gain (loss) $ (3,245) $ 17,078 $ 2,601