how do i work out times interest earned?

please show me the equation as well

Consolidated Balance Sheets - USD ($) $ in Millions Current Assets: Cash and cash equivalents Short-term investments Accounts receivable, net of an allowance for uncollectible accounts of $9 and $11 at December 31, 2015 and 2014, respectively Hedge margin receivable Fuel inventory Expendable parts and supplies inventories, net of an allowance for obsolescence of $114 and $127 at December 31, 2015 and 2014, respectively Hedge derivatives asset Prepaid expenses and other Total current assets Property and Equipment, Net: Property and equipment, net of accumulated depreciation and amortization of $10,871 and $9,340 at December 31, 2015 and 2014, respectively Other Assets: Goodwill Identifiable intangibles, net of accumulated amortization of $811 and $793 at December 31, 2015 and 2014, respectively Deferred income taxes, net Other noncurrent assets Total other assets Total assets Current Liabilities: Current maturities of long-term debt and capital leases Air traffic liability Accounts payable Accrued salaries and related benefits Hedge derivatives liability Frequent flyer deferred revenue Other accrued liabilities Total current liabilities Noncurrent Liabilities: Long-term debt and capital leases Pension, postretirement and related benefits Frequent flyer deferred revenue Other noncurrent liabilities Total noncurrent liabilities Commitments and Contingencies Stockholders' Equity: Common stock at $0.0001 par value; 1,500,000,000 shares authorized, 799,850,675 and 845,048,310 shares issued at December 31, 2015 and 2014, respectively Additional paid-in capital Retained earnings Accumulated other comprehensive loss Treasury stock, at cost, 21,066,684 and 19,790,077 shares at December 31, 2015 and 2014, respectively Total stockholders' equity Total liabilities and stockholders' equity Consolidated Statements of Operations - USD ($) $ in Millions Passenger: Mainline Regional carriers Total passenger revenue Cargo Other Total operating revenue Operating Expense: Salaries and related costs Aircraft fuel and related taxes Regional carriers expense Aircraft maintenance materials and outside repairs Contracted services Depreciation and amortization Passenger commissions and other selling expenses Landing fees and other rents Profit sharing Passenger service Aircraft rent Restructuring and other Other Total operating expense Operating Income Non-Operating Expense: Interest expense, net Interest Portion of Lease, net Total non-operating expense, net Income Before Income Taxes Income Tax (Provision) Benefit Net Income Times Interest Earned Fixed Charge Coverage Debt Ratio Debt to Equity Ratio Debt to Tangible Net Worth Dec. 31, 2015 Dec. 31, 2014 $ 1,972 1,465 2,020 $ 2,088 1,217 2,297 119 379 318 925 534 318 1,987 796 9,056 1,078 701 9,158 23,039 21,929 9,794 4,861 9,794 4,603 4,956 1,428 21,039 53,134 7,595 926 22,918 54,005 1,563 4,503 2,743 3,195 2,581 1,635 1,306 17,526 1,184 4,296 2,622 2,266 2,772 1,580 2,127 16,847 6,766 13,855 2,246 1,891 $ 24,758 8,477 15,138 2,602 2,128 $ 28,345 $0 $0 10,875 7,623 (7,275) (373) 12,981 3,456 (7,311) (313) 10,850 $ 53,134 8,813 $ 54,005 12 Months Ended Dec. 31, 2015 Dec. 31, 2014 $ 28,898 5,884 34,782 813 5,109 40,704 $ 28,688 6,266 34,954 934 4,474 40,362 8,776 6,544 4,241 1,848 1,848 1,835 1,672 1,493 1,490 872 250 35 1,998 32,902 7,802 8,120 11,668 5,237 1,828 1,749 1,771 1,700 1,442 1,085 810 233 716 1,797 38,156 2,206 (481) (164) (645) 7,157 (2,631) $ 4,526 (650) (484) (1,134) 1,072 (413) $ 659 Note: There is no capitalized Interest in this example 0 0 0 0 0 0 0 0 0 0