CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Current Assets:
Cash and Cash Equivalents	$ 71,587	$ 92,086
Restricted Cash	22,776	10,842
Investments	171,638	178,936
Accounts Receivable, net of an allowance for credit losses of $245 and $231, respectively	35,464	35,124
Short-term Lessor Maintenance Deposits	1,279	1,241
Inventory, net of a reserve for obsolescence of $1,183 and $1,107, respectively	6,805	7,659
Prepaid Expenses	11,621	11,423
Other Current Assets	4,823	8,179
Total Current Assets	325,993	345,490
Property & Equipment, net:
Finance Lease Assets	261,991	261,991
Total Property & Equipment	1,058,851	962,413
Accumulated Depreciation & Amortization	(190,580)	(176,746)
Total Property & Equipment, net	868,271	785,667
Other Assets:
Goodwill	222,223	222,223
Other Intangible Assets, net of accumulated amortization of $19,890 and $18,890, respectively	86,109	85,110
Operating Lease Right-of-use Assets	21,929	22,182
Aircraft Deposits	9,374	9,134
Long-term Lessor Maintenance Deposits	35,253	32,433
Deferred Tax Asset	2,389	12,956
Other Assets	10,185	9,217
Total Other Assets	387,462	393,255
Total Assets	1,581,726	1,524,412
Current Liabilities:
Accounts Payable	58,455	62,370
Accrued Salaries, Wages, and Benefits	28,523	26,521
Accrued Transportation Taxes	15,403	17,666
Air Traffic Liabilities	141,613	157,995
Finance Lease Obligations	18,506	17,990
Loyalty Program Liabilities	9,664	13,963
Operating Lease Obligations	6,578	6,296
Current Maturities of Long-term Debt, net	66,194	57,548
Income Tax Receivable Agreement Liability	8,165	2,260
Other Current Liabilities	13,267	14,519
Total Current Liabilities	366,368	377,128
Long-term Liabilities:
Finance Lease Obligations	228,513	233,306
Loyalty Program Liabilities	4,135	1,474
Operating Lease Obligations	19,521	19,836
Long-term Debt, net	346,065	294,687
Income Tax Receivable Agreement Liability	92,855	101,540
Other Long-term Liabilities	3,262	3,729
Total Long-term Liabilities	694,351	654,572
Total Liabilities	1,060,719	1,031,700
Commitments and Contingencies (see Note 12)
Common Stock, Number of Shares, Par Value and Other Disclosure [Abstract]
Common stock, with $0.01 par value, 995,000,000 shares authorized, 58,364,752 and 58,217,647 issued and 56,241,005 and 57,325,238 outstanding at March 31, 2023 and December 31, 2022, respectively	584	582
Preferred Stock, Number of Shares, Par Value and Other Disclosure [Abstract]
Preferred stock, with $0.01 par value, 5,000,000 shares authorized, no shares issued and outstanding at March 31, 2023 and December 31, 2022	0	0
Treasury stock, at cost, 2,123,747 and 892,409 shares held at March 31, 2023 and December 31, 2022, respectively	(40,162)	(17,605)
Additional Paid-In Capital	500,627	488,494
Retained Earnings	60,376	22,048
Accumulated Other Comprehensive Loss	(418)	(807)
Total Stockholders' Equity	521,007	492,712
Total Liabilities and Stockholders' Equity	1,581,726	1,524,412
Aircraft and Flight Equipment
Property & Equipment, net:
Property & Equipment, net:	643,924	636,584
Aircraft and Flight Equipment Held for Operating Lease
Property & Equipment, net:
Property & Equipment, net:	92,627	0
Ground Equipment and Leasehold Improvements
Property & Equipment, net:
Property & Equipment, net:	37,664	35,948
Computer Hardware and Software
Property & Equipment, net:
Property & Equipment, net:	9,327	10,831
Rotable Parts
Property & Equipment, net:
Property & Equipment, net:	$ 13,318	$ 17,059