FAIR VALUE MEASUREMENTS - Quantitative Information about Level 3 Fair Value (Details) - Fuel derivative contracts - Significant unobservable inputs (Level 3) - Measurement Input, Option Volatility [Member]	Dec. 31, 2023
2024 | Maximum
Quantitative Information About Level 3 [Line Items]
Derivative asset, measurement input	0.41
2024 | Weighted Average [Member]
Quantitative Information About Level 3 [Line Items]
Derivative asset, measurement input	0.31
2024 | Minimum
Quantitative Information About Level 3 [Line Items]
Derivative asset, measurement input	0.20
2025 | Maximum
Quantitative Information About Level 3 [Line Items]
Derivative asset, measurement input	0.28
2025 | Weighted Average [Member]
Quantitative Information About Level 3 [Line Items]
Derivative asset, measurement input	0.27
2025 | Minimum
Quantitative Information About Level 3 [Line Items]
Derivative asset, measurement input	0.26
2026 | Maximum
Quantitative Information About Level 3 [Line Items]
Derivative asset, measurement input	0.27
2026 | Weighted Average [Member]
Quantitative Information About Level 3 [Line Items]
Derivative asset, measurement input	0.26
2026 | Minimum
Quantitative Information About Level 3 [Line Items]
Derivative asset, measurement input	0.26