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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2017 | Sep. 30, 2016
Cash flows from operating activities: |  |
Net Income | $ 661 | $ 700
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 275 | 281
Stock-based compensation and other | 43 | 19
Changes in certain assets and liabilities: |  |
Changes in deferred tax provision | 217 | 47
Increase in air traffic liability | 254 | 116
Increase in deferred revenue | 46 | 60
Other—net | (139) | (17)
Net cash provided by operating activities | 1,357 | 1,206
Property and equipment additions: |  |
Aircraft and aircraft purchase deposits | (679) | (408)
Other flight equipment | (70) | (35)
Other property and equipment | (92) | (66)
Total property and equipment additions, including capitalized interest | (841) | (509)
Purchases of marketable securities | (1,408) | (775)
Sales and maturities of marketable securities | 1,069 | 638
Other investing activities | 38 | 5
Net cash used in investing activities | (1,142) | (641)
Cash flows from financing activities: |  |
Proceeds from issuance of debt | 0 | 1,546
Long-term debt payments | (265) | (93)
Common stock repurchases | (50) | (193)
Dividends paid | (111) | (102)
Other financing activities | 27 | 22
Net cash provided (used) by financing activities | (399) | 1,180
Net increase (decrease) in cash and cash equivalents | (184) | 1,745
Cash and cash equivalents at beginning of year | 328 | 73
Cash and cash equivalents at end of the period | 144 | 1,818
Cash paid during the period for: |  |
Interest (net of amount capitalized) | 68 | 12
Income taxes | $ 129 | $ 321

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