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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Cash flows from operating activities: |  |  |
Net Income | $ 1,034 | $ 814 | $ 848
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 372 | 363 | 320
Stock-based compensation and other | 55 | 26 | 25
Changes in certain assets and liabilities: |  |  |
Changes in deferred tax provision | 19 | 94 | 56
(Increase) decrease in accounts receivable | (39) | (46) | 47
Increase (decrease) in air traffic liability | 88 | 9 | 38
Increase (decrease) in deferred revenue | 63 | 83 | 57
Changes in pension and other postretirement benefits | 17 | 23 | 36
Other—net | (19) | 20 | 157
Net cash provided by operating activities | 1,590 | 1,386 | 1,584
Property and equipment additions: |  |  |
Aircraft and aircraft purchase deposits | (804) | (528) | (681)
Other flight equipment | (96) | (53) | (79)
Other property and equipment | (126) | (97) | (71)
Total property and equipment additions | (1,026) | (678) | (831)
Acquisition of Virgin America, net of cash acquired | 0 | (1,951) | 0
Purchases of marketable securities | (1,569) | (960) | (1,327)
Sales and maturities of marketable securities | 1,388 | 962 | 1,175
Proceeds from disposition of assets and changes in restricted deposits | 75 | 5 | 53
Net cash used in investing activities | (1,132) | (2,622) | (930)
Cash flows from financing activities: |  |  |
Proceeds from issuance of long-term debt, net of issuance costs | 0 | 2,044 | 0
Long-term debt payments | (397) | (249) | (116)
Common stock repurchases | (75) | (193) | (505)
Cash dividend paid | (148) | (136) | (102)
Other financing activities | 28 | 25 | 35
Net cash provided by (used in) financing activities | (592) | 1,491 | (688)
Net increase (decrease) in cash and cash equivalents | (134) | 255 | (34)
Cash and cash equivalents at beginning of year | 328 | 73 | 107
Cash and cash equivalents at end of year | 194 | 328 | 73
Cash paid during the year for: |  |  |
Interest, net of amount capitalized | 84 | 24 | 8
Income taxes, net of refunds received | $ 177 | $ 459 | $ 349

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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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