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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017
Cash flows from operating activities: |  |
Net Income | $ 197 | $ 386
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 191 | 180
Stock-based compensation and other | 17 | 25
Changes in certain assets and liabilities: |  |
Changes in deferred tax provision | 67 | 127
Increase in air traffic liability | 306 | 384
Increase in deferred revenue | 52 | 69
Other—net | (104) | (87)
Net cash provided by operating activities | 726 | 1,084
Property and equipment additions: |  |
Aircraft and aircraft purchase deposits | (271) | (404)
Other flight equipment | (56) | (45)
Other property and equipment | (96) | (63)
Total property and equipment additions, including capitalized interest | (423) | (512)
Purchases of marketable securities | (529) | (1,010)
Sales and maturities of marketable securities | 474 | 541
Other investing activities | 10 | 10
Net cash used in investing activities | (468) | (971)
Cash flows from financing activities: |  |
Long-term debt payments | (258) | (159)
Common stock repurchases | (25) | (22)
Dividends paid | (79) | (74)
Other financing activities | 15 | 12
Net cash used in financing activities | (347) | (243)
Net increase (decrease) in cash, cash equivalents, and restricted cash | (89) | (130)
Cash, cash equivalents, and restricted cash at beginning of year | 197 | 328
Cash, cash equivalents, and restricted cash at end of the period | 108 | 198
Cash paid during the period for: |  |
Interest (net of amount capitalized) | 39 | 42
Income taxes | $ 0 | $ 14

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