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SUPPLEMENTAL FINANCIAL INFORMATION | 6 Months Ended
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Jun. 30, 2018
Disclosure Text Block [Abstract] |
SUPPLEMENTAL FINANCIAL INFORMATION | SUPPLEMENTAL FINANCIAL INFORMATION
(in millions) | June 30, 2018 |  | December 31, 2017
Derivative contracts | $ | 275 |  |  | $ | 136 |
Intangible assets, net | 406 |  |  | 413 |
Capital lease receivable | 68 |  |  | 76 |
Non-current prepaid maintenance | 94 |  |  | 5 |
Other | 178 |  |  | 156 |
Other assets | $ | 1,021 |  |  | $ | 786 |
(in millions) | June 30, 2018 |  | December 31, 2017
Accounts payable trade | $ | 280 |  |  | $ | 186 |
Salaries payable | 215 |  |  | 201 |
Taxes payable | 277 |  |  | 203 |
Aircraft maintenance payable | 54 |  |  | 38 |
Fuel payable | 95 |  |  | 123 |
Other payables | 417 |  |  | 569 |
Accounts payable | $ | 1,338 |  |  | $ | 1,320 |
(in millions) | June 30, 2018 |  | December 31, 2017
ProfitSharing and savings plans | $ | 299 |  |  | $ | 579 |
Aircraft and other lease related obligations | 39 |  |  | 40 |
Permanently grounded aircraft liability (a) | 5 |  |  | 34 |
Vacation pay | 383 |  |  | 365 |
Contract ratification bonuses | 96 |  |  | 83 |
Health | 97 |  |  | 100 |
Workers compensation | 170 |  |  | 172 |
Property and income taxes | 72 |  |  | 57 |
Other | 200 |  |  | 270 |
Accrued liabilities | $ | 1,361 |  |  | $ | 1,700 |
(in millions) | June 30, 2018 |  | December 31, 2017
Postretirement obligation | $ | 288 |  |  | $ | 275 |
Non-current lease-related obligations | 65 |  |  | 85 |
Permanently grounded aircraft liability (a) | 5 |  |  | 13 |
Other deferred compensation | 247 |  |  | 237 |
Derivative contracts | 23 |  |  | 21 |
Other | 64 |  |  | 76 |
Other noncurrent liabilities | $ | 692 |  |  | $ | 707 |
(a) These amounts represent the current and noncurrent portion of the Company's cease-use liability recorded as a result of the Company grounding its remaining leased Boeing 737-300 aircraft in 2017. The decrease was primarily related to contractual rent obligations paid. For further details on fuel derivative and interest rate derivative contracts, see Note 3. Other Operating Expenses Other operating expenses consist of distribution costs, advertising expenses, personnel expenses, professional fees, aircraft rentals, and other operating costs, none of which individually exceeded 10 percent of Operating expenses.

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