CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
CONSOLIDATED STATEMENTS OF CASH FLOWS
Net Income (Loss)	$ 77,470	$ (3,904)	$ 46,072
Adjustments to reconcile Net Income (Loss) to Cash from Operating Activities:
Depreciation and Amortization	55,019	48,086	34,877
Tax Receivable Agreement Adjustment	(16,400)
Operating Lease Right-of-use Assets	16,477	25,880	33,541
Non-Cash (Gain) Loss on Asset Transactions, net	(12,673)	413	1,249
Unrealized (Gain) Loss on Fuel Derivatives	(3,527)	12,206	(10,791)
Amortization of Over-market Liabilities	(5,236)	(10,421)	(14,064)
Deferred Income Taxes	17,480	(789)	14,022
Amazon Warrants Vested	5,600	1,866
Stock-based Compensation Expense	5,562	2,110	1,888
Amortization of Debt Issuance Costs	2,463	1,523	481
Changes in Operating Assets and Liabilities:
Accounts Receivable	(481)	(6,282)	(11,353)
Inventory	(484)	(614)	(869)
Prepaid Expenses	(510)	15	2,278
Lessor Maintenance Deposits	(8,089)	(9,415)	(17,466)
Aircraft Lease Deposits	445	1,290	(1,179)
Other Assets	2,351	(5,447)	(566)
Accounts Payable	5,820	(7,174)	9,037
Accrued Transportation Taxes	6,853	(7,845)	3,359
Air Traffic Liabilities	17,486	(15,584)	11,309
Loyalty Program Liabilities	(2,351)	(823)	(5,925)
Operating Lease Obligations	(24,433)	(28,352)	(34,365)
Other Liabilities	13,171	3,635	1,737
Net Cash Provided by Operating Activities	152,013	374	63,272
Cash Flows from Investing Activities:
Purchases of Property & Equipment	(116,369)	(96,298)	(69,816)
Proceeds from the Sale of Property & Equipment	56	200
Purchase of Investments	(1,797)	(927)	(3,394)
Proceeds from the Sale of Investments	1,137	997	3,646
Net Cash Used in Investing Activities	(116,973)	(96,028)	(69,564)
Cash Flows from Financing Activities:
Cash Received from Stock Offering	235,894
Costs of Stock Offering	(8,384)
Proceeds from Stock Option and Warrant Exercises	4,233	21
Proceeds from Borrowings	80,500	265,307	41,630
Proceeds Received for Amazon Warrants			4,667
Repayment of Finance Lease Obligations	(11,931)	(89,697)	(8,258)
Repayment of Borrowings	(85,370)	(69,906)	(10,153)
Debt Issuance Costs	(2,560)	(4,186)	(557)
Net Cash Provided by Financing Activities	212,382	101,539	27,329
Net Increase in Cash, Cash Equivalents and Restricted Cash	247,422	5,885	21,037
Cash, Cash Equivalents and Restricted Cash--Beginning of the Period	70,363	64,478	43,441
Cash, Cash Equivalents and Restricted Cash--End of the Period	317,785	70,363	64,478
Supplemental information:
Cash Payments for Interest	23,601	20,304	16,424
Cash Payments for Income Taxes, net	172	47	385
Lease Deposits Applied Against the Purchase of Aircraft	3,296	19,976
Aircraft and Flight Equipment Acquired through Finance Leases	91,134		108,978
Right-of-use Assets Acquired through Operating Leases			5,470
Purchases of Property & Equipment in Accounts Payable	$ 221	$ 734	$ 991