Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Jan. 31, 2014	Jan. 31, 2013
Operating activities:
Net loss	$ (144,838)	$ (87,531)
Earnings from discontinued operations, net of tax	0	1,024
Income (loss) from continuing operations	(144,838)	(88,555)
Adjustments to reconcile net loss to cash flows provided by (used in) operating activities:
Depreciation	106,158	84,646
Gain (loss) on disposal of assets	1,943	9,019
Asset impairments	22,956	24,218
Earnings from equity accounted investees	(5,990)	(2,687)
Deferred income taxes	(378)	22,944
Non-cash stock-based compensation expense	23,148	334
Amortization of unfavorable contract credits	0	(2,842)
Amortization of lease related fixed interest rate obligations	(1,135)	(2,136)
Amortization of long-term debt and lease deferred financing costs	10,246	7,511
Non-cash accrued interest income on funded residual value guarantees	(4,800)	(5,329)
Mark to market loss (gain) on derivative instruments	(8,231)	6,884
Non-cash defined benefit pension expense (note 13)	344	5,277
Defined benefit contributions and benefits paid	(35,559)	(34,215)
Increase to deferred lease financing costs	(4,228)	(2,751)
Unrealized loss (gain) on foreign currency exchange translation	24,843	(8,780)
Other	4,029	6,480
Decrease in cash resulting from changes in operating assets and liabilities (note 15)	29,977	(46,306)
Cash used in operating activities	18,485	(26,288)
Financing activities:
Sold interest in accounts receivable, net of collections	(5,173)	(6,021)
Proceeds from issuance of capital stock	291,313	0
Proceeds from issuance of senior secured notes	0	202,000
Proceeds from issuance of senior unsecured notes	300,000	0
Long-term debt proceeds (note 17 (e))	760,000	812,449
Long-term debt repayments (note 17 (e))	(888,656)	(817,594)
Increase in revolver and notes deferred financing costs	(14,034)	(3,793)
Related party loans (note 17(c))	(25,148)	0
Cash provided by (used in) financing activities	418,302	187,041
Investing activities:
Property and equipment additions	(474,158)	(318,558)
Proceeds from disposal of property and equipment	444,570	207,896
Aircraft deposits net of lease inception refunds	(102,388)	(49,517)
Restricted cash	8,184	2,407
Distribution from equity investments	2,306	745
Cash provided by (used in) investing activities	(121,486)	(157,027)
Cash provided by (used in) continuing operations	315,301	3,726
Cash flows provided by (used in) discontinued operations:
Cash flows provided by operating activities	0	1,024
Cash flows used in financing activities	0	(1,024)
Cash provided by (used in) discontinued operations	0	0
Effect of exchange rate changes on cash and cash equivalents	(21,957)	42
Change in cash and cash equivalents during the period	293,344	3,768
Cash and cash equivalents, beginning of period	123,801	55,639
Cash and cash equivalents, end of period	$ 417,145	$ 59,407