Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current Assets
Cash and cash equivalents	$ 78,342	$ 69,454
Restricted cash	820	819
Accounts receivable, net	4,451	5,525
Spare parts and supplies, net	7,703	7,819
Contract costs	400	400
Prepaid expenses and other	1,433	1,003
Total Current Assets	93,149	85,020
Property and Equipment
Flight property and equipment	261,641	242,613
Ground property and equipment	8,314	8,305
Less accumulated depreciation	(106,937)	(99,680)
Net Property and Equipment	163,018	151,238
Other Assets
Operating lease right of use asset	19,761	24,026
Intangibles	5,300	5,300
Long-term investments	4,275	4,275
Long-term contract costs	767	867
Other	1,961	1,906
Total Other Assets	32,064	36,374
Total Assets	288,231	272,632
Current Liabilities
Accounts payable	17,872	16,608
Accrued payroll and employee benefits	15,719	15,474
Current portion of operating lease liability	5,376	6,311
Other accrued expenses	789	327
Contract liabilities	7,100	8,342
Income taxes payable	193	213
Current portion of long-term debt (stated principal amount of $7,198 at March 31, 2020 and December 31, 2019)	13,545	12,845
Total Current Liabilities	60,594	60,120
Other Liabilities
Long-term debt (stated principal amount of $96,988 at March 31, 2020 and December 31, 2019)	107,138	107,838
Long-term promissory note	4,275	4,275
Deferred tax liability	2,592	2,599
Long-term operating lease liability	9,698	10,538
Long-term contract liabilities	7,153	8,086
Other	1,646	1,655
Total Long-Term Liabilities	132,502	134,991
Commitments and Contingencies (Note 8)
Mezzanine Equity Series C Convertible Redeemable Preferred Stock, $0.01 par value, 4,000,000 shares authorized, issued and outstanding at March 31, 2020 and December 31, 2019	13,365
Stockholders' Equity
Common Stock, $0.01 par value, 100,000,000 shares authorized, 55,481,000 shares issued and 54,863,305 shares outstanding at March 31, 2020 and December 31, 2019	555	555
Additional paid-in capital	288,815	288,980
Retained deficit	(207,119)	(211,533)
Treasury stock, at cost, 617,835 shares issued at March 31, 2020 and December 31, 2019	(481)	(481)
Total Stockholders' Equity	81,770	77,521
Total Liabilities and Stockholders' Equity	$ 288,231	$ 272,632