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FINANCIAL RISK MANAGEMENT - Narrative (Details) | 12 Months Ended |  |  |
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Dec. 31, 2023 USD ($) debtInstrument cluster $ / bbl | Dec. 31, 2022 USD ($) | Nov. 03, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Financial Risk Management [Line Items] |  |  |  |  |
Parallel movement (usd per barrel) | $ / bbl | 5 |  |  |  |
Vertical drop value | $ 5 |  |  |  |
Lower fuel cost | 131,600,000 |  |  |  |
Vertical rise value | 5 |  |  |  |
Higher fuel costs | 131,300,000 |  |  |  |
Non hedging derivative net of premiums | $ 0 | $ 1,800,000 |  |  |
Exchange rate, percentage | 10.00% |  |  |  |
Loss on hedge ineffectiveness recognised in profit or 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 | 2 |  |  |  |
Borrowings | $ 6,936,188,000 | 6,781,880,000 | $ 6,800,000,000 | $ 10,396,482,000 | $ 10,853,860,000
Derivative margins | 11,000,000.0 | 7,500,000 |  |  |
Fuel-Price Risk | Fair Value Of Fuel Price Derivatives |  |  |  |  |
Financial Risk Management [Line Items] |  |  |  |  |
Fuel hedge net of premiums | 15,700,000 | 18,800,000 |  |  |
Liquidity Risk |  |  |  |  |
Financial Risk Management [Line Items] |  |  |  |  |
Market value of the fuel positions | 22,100,000 | 12,600,000 |  |  |
Liquid funds | 1,715,000,000 | 1,217,000,000 |  |  |
Liquidity Risk | Revolving Credit Facility |  |  |  |  |
Financial Risk Management [Line Items] |  |  |  |  |
Borrowings | 1,100,000,000 |  |  |  |
Liquidity Risk | Revolving Credit Facility 1 |  |  |  |  |
Financial Risk Management [Line Items] |  |  |  |  |
Borrowings | 600,000,000 |  |  |  |
Liquidity Risk | Revolving Credit Facility 2 |  |  |  |  |
Financial Risk Management [Line Items] |  |  |  |  |
Borrowings | 500,000,000 |  |  |  |
Exchange Rate Risk |  |  |  |  |
Financial Risk Management [Line Items] |  |  |  |  |
Gains (losses) net of premiums | (10,100,000) | 5,200,000 |  |  |
FX |  |  |  |  |
Financial Risk Management [Line Items] |  |  |  |  |
Market value of the fuel positions | (1,500,000) | 200,000 |  |  |
Current hedging amount | $ 414,000,000 | $ 108,000,000 |  |  |
Fluctuations In Interest Rates |  |  |  |  |
Financial Risk Management [Line Items] |  |  |  |  |
Interest rate derivative positions | 50.00% | 52.00% |  |  |
Cumulative Translation Adjustment |  |  |  |  |
Financial Risk Management [Line Items] |  |  |  |  |
Depreciate exchange rate | 10.00% |  |  |  |
Interest Rate Risk |  |  |  |  |
Financial Risk Management [Line Items] |  |  |  |  |
Losses for premiums paid | $ 1,800,000 |  |  |  |
Value of interest rate derivative positions amounted | 0 | $ 8,800,000 |  |  |
Interest Rate Risk | Right of use |  |  |  |  |
Financial Risk Management [Line Items] |  |  |  |  |
Settlement of derivative amount | 14,900,000 | $ 100,000 |  |  |
Depreciation expense of the right-of-use | 1,100,000 |  |  |  |
Interest Rate Risk | Leased aircraft |  |  |  |  |
Financial Risk Management [Line Items] |  |  |  |  |
Settlement of derivative amount | $ 14,800,000 |  |  |  |
Credit Risk |  |  |  |  |
Financial Risk Management [Line Items] |  |  |  |  |
Risk exposure | 24.00% |  |  |  |
Sales Risk |  |  |  |  |
Financial Risk Management [Line Items] |  |  |  |  |
Risk exposure | 22.00% |  |  |  |
Credit Card Risk |  |  |  |  |
Financial Risk Management [Line Items] |  |  |  |  |
Risk exposure | 29.00% |  |  |  |
Cash Sales Risk |  |  |  |  |
Financial Risk Management [Line Items] |  |  |  |  |
Risk exposure | 9.00% |  |  |  |
Cargo Business Risk |  |  |  |  |
Financial Risk Management [Line Items] |  |  |  |  |
Risk exposure | (5.00%) |  |  |  |
Expect Credit Loss Risk |  |  |  |  |
Financial Risk Management [Line Items] |  |  |  |  |
Risk exposure | (4.00%) |  |  |  |
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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