REVENUE - Contract balances (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
REVENUE
Total Contract Assets	$ 13,347	$ 4,135
Total Contract Liabilities	184,532	176,899
Air Traffic Liabilities
REVENUE
Total Contract Liabilities	167,024	160,686
Loyalty Program Liabilities
REVENUE
Total Contract Liabilities	14,846	14,601	$ 13,737
Amazon Contract
REVENUE
Total Contract Liabilities	1,686	1,612
Credit Card Program
REVENUE
Total Contract Liabilities	976	0
Amazon Contract
REVENUE
Total Contract Assets	$ 13,347	$ 4,135