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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Cash flows from operating activities: |  |
Net Income | $ 99 | $ 184
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 90 | 88
Stock-based compensation and other | 13 | 9
Changes in certain assets and liabilities: |  |
Changes in deferred tax provision | 48 | (8)
Increase in air traffic liability | 369 | 199
Increase in deferred revenue | 1 | 36
Other—net | (150) | 17
Net cash provided by operating activities | 470 | 525
Property and equipment additions: |  |
Aircraft and aircraft purchase deposits | (160) | (91)
Other flight equipment | (20) | (15)
Other property and equipment | (36) | (13)
Total property and equipment additions, including capitalized interest | (216) | (119)
Purchases of marketable securities | (557) | (358)
Sales and maturities of marketable securities | 285 | 140
Other investing activities | 0 | 1
Net cash used in investing activities | (488) | (336)
Cash flows from financing activities: |  |
Long-term debt payments | (101) | (36)
Common stock repurchases | 0 | (127)
Dividends paid | (37) | (34)
Other financing activities | 11 | 13
Net cash used in financing activities | (127) | (184)
Net increase (decrease) in cash and cash equivalents | (145) | 5
Cash and cash equivalents at beginning of year | 328 | 73
Cash and cash equivalents at end of the period | 183 | 78
Cash paid during the period for: |  |
Interest (net of amount capitalized) | 26 | 8
Income taxes paid | $ 2 | $ 13

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