Commitments (Tables)

9 Months Ended

12 Months Ended

Jan. 31, 2013

Apr. 30, 2012

Summary of Operating Leases

The minimum lease rentals required under operating leases are payable in the following amounts over the following years ended January 31:

	Aircraft operating leases		Building, land and equipment  operating leases		Total operating leases
2014	$	218,307	$	11,325	$	229,632
2015		198,112		9,332		207,444
2016		188,023		7,784		195,807
2017		160,182		6,463		166,645
2018		142,327		4,946		147,273
and thereafter		339,063		59,080		398,143
	$	1,246,014	$	98,930	$	1,344,944

The minimum lease rentals required under such leases are payable in the following amounts over the following fiscal years:

	Aircraft operating leases		Building, land and equipment operating leases		Total operating leases
2013	$	209,352	$	8,112	$	217,464
2014		184,249		7,222		191,471
2015		165,130		5,894		171,024
2016		147,580		4,668		152,248
2017		124,055		3,888		127,943
Thereafter		356,090		61,112		417,202
	$	1,186,456	$	90,896	$	1,277,352