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COMMITMENTS AND CONTINGENCIES - Narrative (Details) $ in Millions | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Jan. 31, 2024 aircraft | Jun. 30, 2023 aircraft | Dec. 31, 2023 USD ($)
Future aircraft purchase commitments |  |  |
Future Purchase Commitments |  |  |
Future aircraft purchase commitments | $ |  |  | $ 17,530
A330-900 |  |  |
Future Purchase Commitments |  |  |
Number of aircraft agreed to be acquired |  | 1 |
A220-300 |  |  |
Future Purchase Commitments |  |  |
Number of aircraft purchase rights exercised |  | 26 |
A350-1000 | Subsequent event |  |  |
Future Purchase Commitments |  |  |
Number of aircraft agreed to be acquired | 20 |  |
A350-1000 Widebody | Subsequent event |  |  |
Future Purchase Commitments |  |  |
Number of optional additional aircrafts | 20 |  |

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