Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Cash Flows From Operating Activities
Net (loss) income	$ (19,214)	$ 181,313
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation, amortization and obsolescence allowance	25,238	22,145
Aircraft lease termination costs	19,353
Amortization of contract costs	(3,725)	(3,480)
Amortization of engine overhauls	4,067	3,613
Deferred income taxes	744	(4,359)
Loss on disposition of property	2,528	225
Gain on extinguishment of debt		(198,729)
Debt restructuring costs		(641)
Changes in operating assets and liabilities:
Accounts receivable	3,989	(1,654)
Spare parts and supplies	(402)	1,266
Prepaid expenses and other	2,466	(4,995)
Operating lease right of use asset	(1,987)
Accounts payable	(7,706)	(3,401)
Accrued payroll and employee benefits	(372)	1,560
Other accrued expenses	(996)	4,985
Contract liabilities	1,417	12,941
Income taxes payable	(100)	146
Other long-term liabilities	246	4,663
Net Cash Provided by Operating Activities	25,546	15,598
Cash Flows From Investing Activities
Restricted cash	(5)	(4)
Additions to property and equipment	(21,498)	(31,583)
Proceeds on disposition of property and equipment	562	131
Net Cash Used in Investing Activities	(20,941)	(31,456)
Cash Flows From Financing Activities
Repayments of long-term debt	(7,198)
Proceeds from note payable	11,790	15,199
Net Cash Provided by Financing Activities	4,592	15,199
Increase (Decrease) in Cash and Cash Equivalents	9,197	(659)
Cash and Cash Equivalents, beginning of year	60,257	60,916
Cash and Cash Equivalents, end of year	$ 69,454	$ 60,257