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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Cash flows from operating activities: |  |
Net Income | $ 4 | $ 93
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 94 | 90
Stock-based compensation and other | 8 | 13
Changes in certain assets and liabilities: |  |
Changes in deferred tax provision | 2 | 44
Increase in air traffic liability | 316 | 364
Increase in deferred revenue | 26 | 31
Other—net | (144) | (165)
Net cash provided by operating activities | 306 | 470
Property and equipment additions: |  |
Aircraft and aircraft purchase deposits | (135) | (160)
Other flight equipment | (29) | (20)
Other property and equipment | (71) | (36)
Total property and equipment additions, including capitalized interest | (235) | (216)
Purchases of marketable securities | (238) | (557)
Sales and maturities of marketable securities | 301 | 285
Other investing activities | 8 | 0
Net cash used in investing activities | (164) | (488)
Cash flows from financing activities: |  |
Long-term debt payments | (120) | (101)
Common stock repurchases | (12) | 0
Dividends paid | (39) | (37)
Other financing activities | 15 | 11
Net cash used in financing activities | (156) | (127)
Net increase (decrease) in cash, cash equivalents, and restricted cash | (14) | (145)
Cash, cash equivalents, and restricted cash at beginning of year | 197 | 328
Cash, cash equivalents, and restricted cash at end of the period | 183 | 183
Cash paid during the period for: |  |
Interest (net of amount capitalized) | 24 | 26
Income taxes | $ 0 | $ 2

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- Definition Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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