CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Statement of Cash Flows [Abstract]
Net Income	$ 52,809	$ 52,903	$ 72,181
Adjustments to reconcile Net Income to Cash from Operating Activities:
Depreciation and Amortization	98,878	94,989	88,151
Operating Lease Right-of-use Assets	2,662	2,020	4,291
Gain on Asset Transactions, net	(8,733)	(6,285)	(1,305)
Deferred Income Taxes	17,164	14,427	21,886
Amazon Warrants Expense	4,518	4,357	6,066
Stock-based Compensation Expense	6,305	6,020	9,274
Other, net	2,419	2,080	(1,298)
Changes in Operating Assets and Liabilities:
Accounts Receivable	(10,754)	11,223	(2,667)
Inventory	(2,355)	(5,041)	(1,458)
Prepaid Expenses	(3,836)	1,986	(4,394)
Lessor Maintenance Deposits	(13,955)	(15,712)	(12,047)
Aircraft Deposits	0	0	(457)
Other Assets	(3,825)	(3,573)	(2,881)
Accounts Payable	3,491	(2,961)	(3,028)
Accrued Transportation Taxes	2,389	2,437	430
Air Traffic Liabilities	6,339	2,690	1
Loyalty Program Liabilities	245	864	(1,701)
Operating Lease Obligations	(3,281)	(2,178)	(4,387)
Other Liabilities	6,626	4,616	7,463
Net Cash Provided by Operating Activities	157,106	164,862	174,120
Cash Flows from Investing Activities:
Purchases of Property & Equipment	(73,128)	(47,332)	(218,160)
Proceeds from the Sale of Property & Equipment	19,250	17,166	4,953
Purchases of Investments	(66,553)	(92,404)	(95,535)
Proceeds from the Maturities of Investments	81,228	130,125	137,220
Other, net	198	842	291
Net Cash (Used in) Provided by Investing Activities	(39,005)	8,397	(171,231)
Cash Flows from Financing Activities:
Common Stock Repurchases	(20,015)	(12,134)	(68,585)
Proceeds from Borrowings	108,000	70,000	119,200
Repayment of Finance Lease Obligations	(20,175)	(45,942)	(21,883)
Repayment of Borrowings	(111,711)	(145,518)	(69,276)
Tax Receivable Agreement Payment	(10,525)	(3,350)	(2,425)
Other, net	1,895	476	832
Net Cash Used in Financing Activities	(52,531)	(136,468)	(42,137)
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash	65,570	36,791	(39,248)
Cash, Cash Equivalents and Restricted Cash--Beginning of the Period	100,471	63,680	102,928
Cash, Cash Equivalents and Restricted Cash--End of the Period	166,041	100,471	63,680
Supplemental information:
Cash Payments for Interest	34,950	42,784	41,454
Income Taxes Paid:
Federal	3,923	90	1,280
State	476	302	218
Total	4,399	392	1,498
Non-cash transactions:
Aircraft and Flight Equipment Acquired under Finance Leases	0	40,116	18,419
Changes to Finance Lease Assets due to Lease Modifications	0	6,513	26,427
Aircraft and Flight Equipment Acquired from Exercise of Finance Lease Purchase Option, net of Accumulated Depreciation	0	40,632	2,386
Purchases of Property & Equipment in Accounts Payable	2,921	3,219	3,035
Property & Equipment Acquired through Maintenance Contract Incentive Liability	0	10,307	2,149
Maintenance Rights Asset Capitalized into Aircraft and Flight Equipment upon End of Lease	8,750	5,054	0
Maintenance Rights Asset Converted to Accounts Receivable upon End of Lease	7,340	4,265	0
Settlement of Accelerated Share Repurchase Program	$ 0	$ 0	$ 7,501