REVENUE - Contract Balances (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
REVENUE
Contract Assets	$ 5,868	$ 4,135
Total Contract Liabilities	130,025	176,899
Air Traffic Liabilities
REVENUE
Total Contract Liabilities	114,257	160,686
Loyalty Program Liabilities
REVENUE
Total Contract Liabilities	14,100	14,601	$ 13,068	$ 13,737
Amazon Contract
REVENUE
Total Contract Liabilities	1,668	1,612
Amazon Contract
REVENUE
Contract Assets	$ 5,868	$ 4,135