Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 617,908	$ 594,499	$ 1,234,658	$ 1,174,434
Passenger Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	617,908	594,499
Resort Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	20,634	16,811	51,322	40,698
Scheduled service
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax			530,576	562,594
Scheduled service \| Passenger Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	247,208	272,715
Ancillary air-related charges
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax			668,152	582,183
Ancillary air-related charges \| Passenger Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	352,873	307,390
Loyalty redemptions
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax			35,930	29,657
Loyalty redemptions \| Passenger Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	17,827	14,394
Rooms \| Resort Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	8,732	6,653	24,163	16,610
Food and beverage \| Resort Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	7,766	7,643	17,728	18,415
Total resort revenue \| Resort Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 4,136	$ 2,515	$ 9,431	$ 5,673