CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash flows from Operating Activities
Net Income	$ (285,000)	$ 68,955,000
Adjustments to reconcile Net Income (Loss) to Cash from Operating Activities:
Depreciation and Amortization	32,182,000	26,823,000
Tax Receivable Agreement Adjustment	8,500,000	(18,700,000)
Operating Lease Right-of-use Assets	5,255,000	9,419,000
Non-Cash Gain on Asset Transactions, net	(79,000)	0
Unrealized Gain on Fuel Derivatives	0	(3,599,000)
Amortization of Over-market Liabilities	(1,687,000)	(3,081,000)
Deferred Income Taxes	1,861,000	16,304,000
Amazon Warrants Vested	2,800,000	2,800,000
Stock-based Compensation Expense	1,495,000	3,613,000
Amortization of Debt Issuance Costs and Debt Securities	515,000	687,000
Loss on Extinguishment of Debt	1,557,000	1,224,000
Changes in Operating Assets and Liabilities:
Accounts Receivable	(8,023,000)	4,265,000
Inventory	(1,184,000)	(224,000)
Prepaid Expenses	(7,733,000)	(6,446,000)
Lessor Maintenance Deposits	(7,356,000)	(3,220,000)
Aircraft Deposits	(1,720,000)	1,496,000
Other Assets	18,000	1,294,000
Accounts Payable	15,692,000	3,546,000
Accrued Transportation Taxes	1,813,000	7,024,000
Air Traffic Liabilities	5,396,000	12,695,000
Loyalty Program Liabilities	(3,113,000)	(1,192,000)
Operating Lease Obligations	(5,698,000)	(28,494,000)
Other Liabilities	(3,146,000)	1,615,000
Net Cash Provided by Operating Activities	37,060,000	96,804,000
Cash Flows from Investing Activities:
Purchases of Property & Equipment	(137,647,000)	(73,699,000)
Proceeds from the Sale of Property & Equipment	515,000	0
Proceeds from Insurance Settlements	8,865,000	0
Purchases of Investments	(71,629,000)	(1,436,000)
Proceeds from the Sale of Investments	935,000	984,000
Net Cash Used in Investing Activities	(198,961,000)	(74,151,000)
Cash Flows from Financing Activities:
Cash Received from Stock Offering	0	235,894,000
Costs of Stock Offering	0	(8,669,000)
Proceeds from Stock Option and Warrant Exercises	1,371,000	26,000
Taxes Paid for Net Stock Settlement of Stock-Based Awards	(31,000)	0
Proceeds from Borrowings	172,507,000	80,500,000
Repayment of Finance Lease Obligations	(24,293,000)	(7,864,000)
Repayment of Borrowings	(86,046,000)	(74,709,000)
Debt Issuance Costs	(2,402,000)	(2,709,000)
Net Cash Provided by Financing Activities	61,106,000	222,469,000
Net (Decrease) Increase in Cash, Cash Equivalents and Restricted Cash	(100,795,000)	245,122,000
Cash, Cash Equivalents and Restricted Cash--Beginning of the Period	317,785,000	70,363,000
Cash, Cash Equivalents and Restricted Cash--End of the Period	216,990,000	315,485,000
Supplemental Cash Flow Information [Abstract]
Lease Deposits Applied Against the Purchase of Aircraft	0	3,296,000
Aircraft and Flight Equipment Acquired through Finance Leases	19,928,000	42,911,000
Finance Lease Asset Modifications	46,311,000	0
Aircraft Acquired From Exercise of Finance Lease Purchase Option, net of Accumulated Depreciation	19,083,000	0
Derecognition of Operating Lease Right-of-Use Assets, net	0	41,135,000
Derecognition of Operating Lease Obligations	0	44,726,000
Reconciliation of Cash, Cash Equivalents and Restricted Cash
Cash and Cash Equivalents	212,858,000	310,723,000
Restricted Cash	4,132,000	4,762,000
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Total	$ 216,990,000	$ 315,485,000