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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2016 | Sep. 30, 2015
Cash flows from operating activities: |  |
Net Income | $ 700 | $ 657
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 281 | 236
Stock-based compensation and other | 19 | 22
Changes in certain assets and liabilities: |  |
Changes in deferred tax provision | 47 | (17)
Increase (decrease) in air traffic liability | 116 | 129
Increase (decrease) in deferred revenue | 60 | 42
Other - net | (17) | 160
Net cash provided by operating activities | 1,206 | 1,229
Property and equipment additions: |  |
Aircraft and aircraft purchase deposits | (408) | (563)
Other flight equipment | (35) | (61)
Other property and equipment | (66) | (44)
Total property and equipment additions, including capitalized interest | (509) | (668)
Purchases of marketable securities | (775) | (876)
Sales and maturities of marketable securities | 638 | 818
Proceeds from disposition of assets and changes in restricted deposits | 5 | (1)
Net cash used in investing activities | (641) | (727)
Cash flows from financing activities: |  |
Proceeds from issuance of debt | 1,546 | 0
Long-term debt payments | (93) | (93)
Common stock repurchases | (193) | (381)
Dividends paid | (102) | (78)
Other financing activities | 22 | 31
Net cash used in financing activities | 1,180 | (521)
Net increase (decrease) in cash and cash equivalents | 1,745 | (19)
Cash and cash equivalents at beginning of year | 73 | 107
Cash and cash equivalents at end of the period | 1,818 | 88
Cash paid during the period for: |  |
Interest (net of amount capitalized) | 12 | 9
Income taxes paid (received) | $ 321 | $ 262

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