Property and Equipment (Tables)

3 Months Ended

Mar. 31, 2018

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

Property and equipment, to be held and used, is summarized as follows (in thousands):

	March 31, 2018			December 31, 2017
Flight equipment	$	1,799,301		$	1,801,808
Ground equipment	53,461			53,523
Leasehold improvements, facilities and office equipment	28,205			26,897
Aircraft modifications and projects in progress	164,414			121,760
	2,045,381			2,003,988
Accumulated depreciation	(868,861		)	(844,026		)
Property and equipment, net	$	1,176,520		$	1,159,962