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FINANCIAL RISK MANAGEMENT - Narrative (Details) | 12 Months Ended |  |
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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 |  |  |

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