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Property and equipment (Tables)

12 Months Ended

Dec. 31, 2017

Text block1 [abstract]

Summary of Property and Equipment


		Land				Flight equipment				Purchase deposits for flight equipment				Ramp and miscellaneous				Furniture, fixtures, equipment a and other				Leasehold improvements				Construction in progress				Total
Cost -
Balance at January 1, 2015		$	6,301			$	2,707,019			$	321,175			$	39,740			$	25,308			$	28,580			$	7,716			$	3,135,839
Transfer of pre-delivery payments			—				161,169				(161,169	)			—				—				—				—				—
Additions			—				178,582				83,064				2,827				2,269				3,190				9,751				279,683
Disposals			—				(16,773	)			—				(25	)			(864	)			(881	)			(2,343	)			(20,886	)
Reclassifications			—				364				—				495				(766	)			4,977				(5,070	)			—

Balance at December 31, 2015		$	6,301			$	3,030,361			$	243,070			$	43,037			$	25,947			$	35,866			$	10,054			$	3,394,636
Transfer of pre-delivery payments			—				27,585				(27,585	)			—				—				—				—				—
Additions			—				94,348				34,680				3,026				1,878				73				7,435				141,440
Disposals			—				(36,812	)			—				(604	)			(1,226	)			(98	)			—				(38,740	)
Adjustments			—				100				—				—				2,363				—				—				2,463
Reclassifications			—				(340	)			—				(289	)			645				9,140				(10,896	)			(1,740	)

Balance at December 31, 2016		$	6,301			$	3,115,242			$	250,165			$	45,170			$	29,607			$	44,981			$	6,593			$	3,498,059
Transfer of pre-delivery payments			—				28,674				(28,674	)			—				—				—				—				—
Additions			—				158,557				192,196				1,461				3,392				1,614				5,246				362,466
Disposals			—				(54,114	)			(54	)			(228	)			(711	)			—				—				(55,107	)
Reclassifications			—				3,870				—				1,950				(4,764	)			3448				(6,061	)			(1,557	)

Balance at December 31, 2017		$	6,301			$	3,252,229			$	413,633			$	48,353			$	27,524			$	50,043			$	5,778			$	3,803,861
Accumulated depreciation -
Balance at January 1, 2015 (reported)		$	—			$	(567,341	)		$	—			$	(26,560	)		$	(18,197	)		$	(18,405	)		$	—			$	(630,503	)
Adjustment on correction of error			—				(181,242	)			—				—				—				—				—				(181,242	)

Balance at January 1, 2015 (restated)		$	—			$	(748,583	)		$	—			$	(26,560	)		$	(18,197	)		$	(18,405	)		$	—			$	(811,745	)
Depreciation for the year			—				(133,045	)			—				(3,214	)			(2,774	)			(4,229	)			—				(143,262	)
Disposals			—				13,341				—				23				581				177				—				14,122
Reclassifications			—				(39	)			—				1,202				(1,501	)			338				—				—

Balance at December 31, 2015 (restated)		$	—			$	(868,326	)		$	—			$	(28,549	)		$	(21,891	)		$	(22,119	)		$	—			$	(940,885	)
Depreciation for the year			—				(141,418	)			—				(3,724	)			(2,284	)			(4,246	)			—				(151,672	)
Disposals			—				13,587				—				524				1,220				12				—				15,343
Adjustments			—				(14	)			—				—				(2,667	)			—				—				(2,681	)
Reclassifications			—				(99	)			—				(116	)			41				174				—				—

Balance at December 31, 2016 (restated)		$	—			$	(996,270	)		$	—			$	(31,865	)		$	(25,581	)		$	(26,179	)		$	—			$	(1,079,895	)
Depreciation for the year			—				(148,188	)			—				(3,811	)			(2,192	)			(4,505	)			—				(158,696	)
Disposals			—				51,233				—				200				704				—				—				52,137
Reclassifications			—				(1,335	)			—				(1,540	)			4,110				(1,235	)			—				—

Balance at December 31, 2017 (restated)		$	—			$	(1,094,560	)		$	—			$	(37,016	)		$	(22,959	)		$	(31,919	)		$	—			$	(1,186,454	)
Carrying amounts -
At December 31, 2015 (restated)		$	6,301			$	2,162,035			$	243,070			$	14,488			$	4,056			$	13,747			$	10,054			$	2,453,751

At December 31, 2016 (restated)		$	6,301			$	2,118,972			$	250,165			$	13,305			$	4,026			$	18,802			$	6,593			$	2,418,164

At December 31, 2017 (restated)		$	6,301			$	2,157,669			$	413,633			$	11,337			$	4,565			$	18,124			$	5,778			$	2,617,407