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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2016 | Jun. 30, 2015
Cash flows from operating activities: |  |
Net Income | $ 444 | $ 383
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 180 | 155
Stock-based compensation and other | 13 | 14
Changes in certain assets and liabilities: |  |
Changes in deferred tax provision | 41 | (44)
Increase (decrease) in air traffic liability | 201 | 209
Increase (decrease) in deferred revenue | 48 | 27
Other - net | (28) | 145
Net cash provided by operating activities | 899 | 889
Property and equipment additions: |  |
Aircraft and aircraft purchase deposits | (268) | (490)
Other flight equipment | (31) | (43)
Other property and equipment | (41) | (26)
Total property and equipment additions, including capitalized interest | (340) | (559)
Purchases of marketable securities | (610) | (711)
Sales and maturities of marketable securities | 357 | 676
Proceeds from disposition of assets and changes in restricted deposits | 3 | 0
Net cash used in investing activities | (590) | (594)
Cash flows from financing activities: |  |
Long-term debt payments | (57) | (58)
Common stock repurchases | (193) | (262)
Dividends paid | (68) | (52)
Other financing activities | 17 | 15
Net cash used in financing activities | (301) | (357)
Net increase (decrease) in cash and cash equivalents | 8 | (62)
Cash and cash equivalents at beginning of year | 73 | 107
Cash and cash equivalents at end of the period | 81 | 45
Cash paid during the period for: |  |
Interest (net of amount capitalized) | 8 | 8
Income taxes paid (received) | $ 182 | $ 108

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