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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2017 | Jun. 30, 2016
Cash flows from operating activities: |  |
Net Income | $ 395 | $ 444
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 180 | 180
Stock-based compensation and other | 25 | 13
Changes in certain assets and liabilities: |  |
Changes in deferred tax provision | 132 | 41
Increase in air traffic liability | 406 | 201
Increase in deferred revenue | 15 | 48
Other—net | (69) | (28)
Net cash provided by operating activities | 1,084 | 899
Property and equipment additions: |  |
Aircraft and aircraft purchase deposits | (404) | (268)
Other flight equipment | (45) | (31)
Other property and equipment | (63) | (41)
Total property and equipment additions, including capitalized interest | (512) | (340)
Purchases of marketable securities | (1,010) | (610)
Sales and maturities of marketable securities | 541 | 357
Other investing activities | 10 | 3
Net cash used in investing activities | (971) | (590)
Cash flows from financing activities: |  |
Long-term debt payments | (159) | (57)
Common stock repurchases | (22) | (193)
Dividends paid | (74) | (68)
Other financing activities | 12 | 17
Net cash used in financing activities | (243) | (301)
Net increase (decrease) in cash and cash equivalents | (130) | 8
Cash and cash equivalents at beginning of year | 328 | 73
Cash and cash equivalents at end of the period | 198 | 81
Cash paid during the period for: |  |
Interest (net of amount capitalized) | 42 | 8
Income taxes | $ 14 | $ 182

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