Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash Flows From Operating Activities
Net income (loss)	$ 4,414	$ (3,084)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, amortization and obsolescence allowance	6,941	5,731
Aircraft lease termination cost	(84)
Amortization of contract costs	(933)	(927)
Amortization of engine overhauls	732	1,013
Deferred income taxes	(7)	205
Loss on disposition of property	544	(7)
Changes in operating assets and liabilities:
Accounts receivable	1,082	1,057
Spare parts and supplies	(199)	(296)
Prepaid expenses and other	(920)	603
Operating lease right of use asset	2,490	4,636
Accounts payable	(1,691)	1,673
Accrued payroll and employee benefits	245	1,272
Other accrued expenses	462	267
Contract liabilities	(1,242)	(3,192)
Income taxes payable	(20)	14
Other long-term liabilities	(9)
Net Cash Provided by Operating Activities	11,805	8,965
Cash Flows From Investing Activities
Restricted cash	(1)	(2)
Additions to property and equipment	(2,918)	(11,937)
Proceeds on disposition of property and equipment	2	7
Net Cash Used in Investing Activities	(2,917)	(11,932)
Cash Flows From Financing Activities
Net Cash Provided by Financing Activities	0	0
Increase (Decrease) in Cash and Cash Equivalents	8,888	(2,967)
Cash and Cash Equivalents, beginning of period	69,454	60,257
Cash and Cash Equivalents, end of period	$ 78,342	$ 57,290