Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Cash Flows From Operating Activities
Net income (loss)	$ 39,763	$ (19,214)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, amortization and obsolescence allowance	27,222	25,238
Aircraft lease termination costs	1,263	19,353
Amortization of contract costs	(2,502)	(3,725)
Amortization of engine overhauls	1,265	4,067
Deferred income taxes	3,601	744
Loss on disposition of property	648	2,528
Changes in operating assets and liabilities:
Accounts receivable	(2,444)	3,989
Notes Receivable	(32,440)	0
Spare parts and supplies	622	(402)
Prepaid expenses and other	(1,885)	2,466
Operating lease right of use asset	2,520	(1,987)
Accounts payable	(7,790)	(7,706)
Accrued payroll and employee benefits	(713)	(372)
Other accrued expenses	18	(996)
Long-term deferred revenue	30,720	0
Contract liabilities	12,297	1,417
Income taxes payable	(106)	(100)
Other long-term liabilities	1,119	246
Net Cash Provided by Operating Activities	73,178	25,546
Cash Flows From Investing Activities
Additions to property and equipment	(8,749)	(21,498)
Proceeds on disposition of property and equipment	95	562
Net Cash Used in Investing Activities	(8,654)	(20,936)
Cash Flows From Financing Activities
Repayments of long-term debt	(12,845)	(7,198)
Proceeds from note payable	10,000	11,790
Dividends paid	(759)	0
Net Cash (Used in) Provided by Financing Activities	(3,604)	4,592
Increase in Cash, Cash Equivalents and Restricted Cash	60,920	9,202
Cash, Cash Equivalents and Restricted Cash, beginning of year	70,273	61,071
Cash, Cash Equivalents and Restricted Cash, end of year	$ 131,193	$ 70,273