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FINANCIAL RISK MANAGEMENT - Narrative (Details)
 12 Months Ended
Dec. 31, 2024
USD ($)
debtInstrument
cluster
$ / bbl
Dec. 31, 2023
USD ($)
Jul. 15, 2024
USD ($)
Nov. 03, 2022
USD ($)
Financial Risk Management [Line Items]        
Parallel movement (usd per barrel) | $ / bbl 5      
Vertical drop value $ 5      
Lower fuel cost 156,700,000      
Vertical rise value 5      
Higher fuel costs $ 138,100,000      
Exchange rate, percentage 10.00%      
Non hedging derivative net of premiums $ 0 $ 1,800,000    
Settlement of derivative, gain (loss) $ (100,000)      
Number of operational activities clusters | cluster 4      
Concentration of scheduled commercial traffic 90.00%      
Percentage covered by credit card administrators 100.00%      
Number of credit facilities | debtInstrument 3      
Undrawn borrowing facilities       $ 1,100,000,000
Line of credit facility, borrowing capacity       $ 2,750,000,000
Derivative margins $ 500,000 12,800,000    
Other financial assets        
Financial Risk Management [Line Items]        
Current financial assets 51,730,000 152,683,000    
Other financial assets | Guarantees for margins of derivatives        
Financial Risk Management [Line Items]        
Current financial assets 466,000 12,829,000    
Revolving Credit Facility        
Financial Risk Management [Line Items]        
Line of credit facility, borrowing capacity 1,575,000,000      
RCF I        
Financial Risk Management [Line Items]        
Undrawn borrowing facilities     $ 800,000,000  
RCF II        
Financial Risk Management [Line Items]        
Undrawn borrowing facilities     $ 750,000,000  
Fuel-Price Risk | Fair Value Of Fuel Price Derivatives        
Financial Risk Management [Line Items]        
Fuel hedge net of premiums, gain (loss) (18,100,000) 15,700,000    
Liquidity Risk        
Financial Risk Management [Line Items]        
Market value of the fuel positions 7,700,000 22,100,000    
Liquid funds 1,958,000,000 1,715,000,000    
Remaining borrowings 25,000,000      
Liquidity Risk | Revolving Credit Facility        
Financial Risk Management [Line Items]        
Undrawn borrowing facilities 1,850,000,000      
Liquidity Risk | RCF I        
Financial Risk Management [Line Items]        
Undrawn borrowing facilities 800,000,000      
Liquidity Risk | RCF II        
Financial Risk Management [Line Items]        
Undrawn borrowing facilities 750,000,000      
Liquidity Risk | Revolving Credit Facility 3        
Financial Risk Management [Line Items]        
Undrawn borrowing facilities 300,000,000      
Exchange Rate Risk        
Financial Risk Management [Line Items]        
Gains net of premiums 10,000,000.0 10,100,000    
FX        
Financial Risk Management [Line Items]        
Market value of the fuel positions 3,100,000 1,500,000    
Current hedging amount $ 165,000,000 $ 404,000,000    
Fluctuations In Interest Rates        
Financial Risk Management [Line Items]        
Interest rate derivative positions 76.00% 50.00%    
Cumulative Translation Adjustment        
Financial Risk Management [Line Items]        
Depreciate exchange rate 10.00%      
Interest Rate Risk        
Financial Risk Management [Line Items]        
Operating leases to fix the income of future plane arrivals amounted   $ 4,680,000    
Interest Rate Risk | Right of use        
Financial Risk Management [Line Items]        
Settlement of derivative, gain (loss) $ 100,000 (14,900,000)    
Interest Rate Risk | Lower Depreciation Expense, Right Of Use Asset        
Financial Risk Management [Line Items]        
Settlement of derivative, gain (loss) $ 1,900,000 $ 1,100,000    
Credit Risk        
Financial Risk Management [Line Items]        
Risk exposure increase (decrease) (4.00%)      
Sales Risk        
Financial Risk Management [Line Items]        
Risk exposure increase (decrease) (2.00%)      
Credit Card Risk        
Financial Risk Management [Line Items]        
Risk exposure increase (decrease) (2.00%)      
Cash Sales Risk        
Financial Risk Management [Line Items]        
Risk exposure increase (decrease) (1.00%)      
Cargo Business Risk        
Financial Risk Management [Line Items]        
Risk exposure increase (decrease) 14.00%      
Expect Credit Loss Risk        
Financial Risk Management [Line Items]        
Risk exposure increase (decrease) (14.00%)      
Bottom of range        
Financial Risk Management [Line Items]        
Exposure term granted for remittances 1 day      
Top of range        
Financial Risk Management [Line Items]        
Exposure term granted for remittances 45 days