CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Current Assets:
Cash and Cash Equivalents	$ 86,930	$ 92,086
Restricted Cash	7,281	10,842
Investments	158,177	178,936
Accounts Receivable, net of an allowance for credit losses of $241 and $231, respectively	26,937	35,124
Short-term Lessor Maintenance Deposits	999	1,241
Inventory, net of a reserve for obsolescence of $1,190 and $1,107, respectively	7,365	7,659
Prepaid Expenses	12,209	11,423
Other Current Assets	2,365	8,179
Total Current Assets	302,263	345,490
Property & Equipment, net:
Finance Lease Assets	276,086	261,991
Total Property & Equipment	1,159,288	962,413
Accumulated Depreciation & Amortization	(211,227)	(176,746)
Total Property & Equipment, net	948,061	785,667
Other Assets:
Goodwill	222,223	222,223
Other Intangible Assets, net of accumulated amortization of $21,325 and $18,890, respectively	86,416	85,110
Operating Lease Right-of-use Assets	18,715	22,182
Aircraft Deposits	9,614	9,134
Long-term Lessor Maintenance Deposits	38,310	32,433
Deferred Tax Asset	0	12,956
Other Assets	9,021	9,217
Total Other Assets	384,299	393,255
Total Assets	1,634,623	1,524,412
Current Liabilities:
Accounts Payable	56,143	62,370
Accrued Salaries, Wages, and Benefits	30,095	26,521
Accrued Transportation Taxes	15,488	17,666
Air Traffic Liabilities	130,264	157,995
Finance Lease Obligations	33,641	17,990
Loyalty Program Liabilities	8,962	13,963
Operating Lease Obligations	4,485	6,296
Current Maturities of Long-term Debt, net	83,204	57,548
Income Tax Receivable Agreement Liability	8,000	2,260
Other Current Liabilities	12,973	14,519
Total Current Liabilities	383,255	377,128
Long-term Liabilities:
Finance Lease Obligations	223,647	233,306
Loyalty Program Liabilities	4,694	1,474
Operating Lease Obligations	18,264	19,836
Long-term Debt, net	365,211	294,687
Deferred Tax Liability	3,356	0
Income Tax Receivable Agreement Liability	93,020	101,540
Other Long-term Liabilities	2,411	3,729
Total Long-term Liabilities	710,603	654,572
Total Liabilities	1,093,858	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, 58,552,727 and 58,217,647 issued and 56,012,229 and 57,325,238 outstanding at June 30, 2023 and December 31, 2022, respectively	586	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 June 30, 2023 and December 31, 2022	0	0
Treasury stock, at cost, 2,540,498 and 892,409 shares held at June 30, 2023 and December 31, 2022, respectively	(47,673)	(17,605)
Additional Paid-In Capital	507,522	488,494
Retained Earnings	80,994	22,048
Accumulated Other Comprehensive Loss	(664)	(807)
Total Stockholders' Equity	540,765	492,712
Total Liabilities and Stockholders' Equity	1,634,623	1,524,412
Aircraft and Flight Equipment
Property & Equipment, net:
Property & Equipment, net:	664,757	636,584
Aircraft and Flight Equipment Held for Operating Lease
Property & Equipment, net:
Property & Equipment, net:	154,161	0
Ground Equipment and Leasehold Improvements
Property & Equipment, net:
Property & Equipment, net:	38,690	35,948
Computer Hardware and Software
Property & Equipment, net:
Property & Equipment, net:	10,388	10,831
Rotable Parts
Property & Equipment, net:
Property & Equipment, net:	$ 15,206	$ 17,059