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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($)
Cash flows from operating activities: |  |
Net Income | $ 588 | $ 414
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 317 | 290
Stock-based compensation and other | 20 | 34
Changes in certain assets and liabilities: |  |
Changes in deferred tax provision | 187 | 122
Increase in air traffic liability | 244 | 144
Increase in deferred revenue | 97 | 106
Pension contribution | (65) | 0
Other—net | (7) | (124)
Net cash provided by operating activities | 1,381 | 986
Property and equipment additions: |  |
Aircraft and aircraft purchase deposits | (286) | (349)
Other flight equipment | (125) | (76)
Other property and equipment | (116) | (129)
Total property and equipment additions, including capitalized interest | (527) | (554)
Purchases of marketable securities | (1,446) | (672)
Sales and maturities of marketable securities | 1,228 | 857
Other investing activities | 37 | 36
Net cash used in investing activities | (708) | (333)
Cash flows from financing activities: |  |
Proceeds from issuance of debt | 356 | 0
Long-term debt payments | (752) | (544)
Common stock repurchases | (53) | (37)
Dividends paid | (129) | (118)
Other financing activities | 40 | 33
Net cash used in financing activities | (538) | (666)
Net increase (decrease) in cash, cash equivalents, and restricted cash | 135 | (13)
Cash, cash equivalents, and restricted cash at beginning of year | 114 | 197
Cash, cash equivalents, and restricted cash at end of the period | 249 |
Cash paid during the period for: |  |
Interest (net of amount capitalized) | 48 | 60
Income taxes, net of refunds received | 2 | $ 0
Cash and cash equivalents | 237 |
Restricted cash included in Prepaid expenses and other current assets | $ 12 |

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- Definition Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as current. 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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3044-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586 + Details
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Balance Type: | debit
Period Type: | instant

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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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Period Type: | duration