REVENUE - Significant Categories of Operating Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
REVENUE
Total Operating Revenues	$ 255,538	$ 249,470	$ 845,808	$ 815,334
Passenger
REVENUE
Total Operating Revenues	201,098	207,764	701,654	698,823
Scheduled Service
REVENUE
Total Operating Revenues	76,746	83,784	308,406	313,056
Charter
REVENUE
Total Operating Revenues	58,673	50,769	167,636	149,090
Ancillary
REVENUE
Total Operating Revenues	65,679	73,211	225,612	236,677
Cargo
REVENUE
Total Operating Revenues	44,023	29,165	106,983	78,560
Other
REVENUE
Total Operating Revenues	$ 10,417	$ 12,541	$ 37,171	$ 37,951