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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Cash flows from operating activities: |  |  |
Net Income | $ 769 | $ 437 | $ 960
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 423 | 398 | 372
Stock-based compensation and other | 29 | 47 | 55
Changes in certain assets and liabilities: |  |  |
Changes in deferred tax provision | 209 | 146 | 45
(Increase) decrease in accounts receivable | 43 | (25) | (39)
Increase (decrease) in air traffic liability | 112 | (18) | 45
Increase (decrease) in deferred revenue | 116 | 149 | 191
Changes in pension and other postretirement benefits | 68 | 52 | 17
Other - net | 18 | 9 | (41)
Net cash provided by operating activities | 1,722 | 1,195 | 1,590
Property and equipment additions: |  |  |
Aircraft and aircraft purchase deposits | (356) | (686) | (804)
Other flight equipment | (178) | (105) | (96)
Other property and equipment | (162) | (169) | (126)
Total property and equipment additions | (696) | (960) | (1,026)
Purchases of marketable securities | (1,810) | (834) | (1,569)
Sales and maturities of marketable securities | 1,674 | 1,116 | 1,388
Proceeds from disposition of assets and changes in restricted deposits | 41 | 47 | 78
Net cash used in investing activities | (791) | (631) | (1,129)
Cash flows from financing activities: |  |  |
Proceeds from issuance of long-term debt, net of issuance costs | 450 | 339 | 0
Long-term debt payments | (1,058) | (807) | (397)
Common stock repurchases | (75) | (50) | (75)
Cash dividend paid | (173) | (158) | (148)
Other financing activities | 43 | 29 | 28
Net cash used in financing activities | (813) | (647) | (592)
Net increase (decrease) in cash, cash equivalents, and restricted cash | 118 | (83) | (131)
Cash, cash equivalents, and restricted cash at beginning of year | 114 | 197 | 328
Cash, cash equivalents, and restricted cash at end of year | 232 | 114 | 197
Cash paid during the year for: |  |  |
Interest, net of amount capitalized | 60 | 72 | 84
Income taxes, net of refunds received | 31 | 0 | 177
Cash and cash equivalents | $ 221 | $ 105 | $ 194

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
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