SUPPLEMENTAL FINANCIAL INFORMATION



	March 31,		December 31,
(in millions)	2013		2012
Fuel derivative contracts	$	172	$	221
Interest rate derivative contracts	29		31
Receivable from third parties for fuel contracts - noncurrent	54		54
Intangible assets	132		138
Non-current investments	43		41
Other	153		148
Other assets	$	583	$	633



	March 31,		December 31,
(in millions)	2013		2012
Retirement plans	$	144	$	135
Aircraft rentals	109		139
Vacation pay	275		270
Health	62		70
Fuel derivative contracts	—		50
Workers compensation	158		159
Accrued taxes	58		67
Other	198		212
Accrued liabilities	$	1,004	$	1,102



	March 31,		December 31,
(in millions)	2013		2012
Postretirement obligation	$	154	$	148
Non-current lease-related obligations	349		376
Airport construction obligation	359		331
Other deferred compensation	144		141
Fuel derivative contracts	12		—
Interest rate derivative contracts	54		37
Other	81		91
Other non-current liabilities	$	1,153	$	1,124

For further details on fuel derivative and interest rate derivative contracts, see Note 5.

Other Operating Expenses

Other operating expenses consist of distribution costs, advertising expenses, personnel expenses, professional fees, and other operating costs, none of which individually exceed 10 percent of Operating expenses.