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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Cash flows from operating activities: |  |
Net Income | $ 4 | $ 4
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 106 | 94
Stock-based compensation and other | 11 | 8
Changes in certain assets and liabilities: |  |
Changes in deferred tax provision | 2 | 2
Increase in air traffic liability | 328 | 316
Increase in deferred revenue | 41 | 26
Other—net | (24) | (144)
Net cash provided by operating activities | 468 | 306
Property and equipment additions: |  |
Aircraft and aircraft purchase deposits | (53) | (135)
Other flight equipment | (29) | (29)
Other property and equipment | (33) | (71)
Total property and equipment additions, including capitalized interest | (115) | (235)
Purchases of marketable securities | (351) | (238)
Sales and maturities of marketable securities | 275 | 301
Other investing activities | 5 | 8
Net cash used in investing activities | (186) | (164)
Cash flows from financing activities: |  |
Proceeds from issuance of debt | 254 | 0
Long-term debt payments | (393) | (120)
Common stock repurchases | (13) | (13)
Dividends paid | (43) | (40)
Other financing activities | 24 | 17
Net cash used in financing activities | (171) | (156)
Net increase (decrease) in cash, cash equivalents, and restricted cash | 111 | (14)
Cash, cash equivalents, and restricted cash at beginning of year | 114 | 197
Cash, cash equivalents, and restricted cash at end of the period | 225 | 183
Cash paid during the period for: |  |
Interest (net of amount capitalized) | 18 | 24
Income taxes | $ 0 | $ 0

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