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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Cash flows from operating activities: |  |  |
Net Income | $ 235 | $ 58 | $ 478
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 451 | 415 | 394
Stock-based compensation and other | 85 | 42 | 51
Special Items - Impairment charges and other (noncash) | 371 | 496 | (1)
Special items - labor and related (noncash) | 51 | 0 | 0
Restructuring Charges | 0 | 0 | (10)
Changes in certain assets and liabilities: |  |  |
Changes in deferred income taxes | 81 | 22 | 104
(Increase) decrease in accounts receivable | (19) | (45) | (69)
Increase (decrease) in air traffic liability | (44) | 17 | 90
Increase in deferred revenue | 106 | 139 | 81
Pension contribution | 0 | 0 | (100)
Proceeds from Income Tax Refunds | 0 | 295 | 3
Other - net | (267) | (21) | 9
Net cash provided by operating activities | 1,050 | 1,418 | 1,030
Property and equipment additions: |  |  |
Aircraft and aircraft purchase deposits | (1,055) | (1,272) | (68)
Other flight equipment | (197) | (208) | (126)
Other property and equipment | (242) | (191) | (98)
Total property and equipment additions | (1,494) | (1,671) | (292)
Purchases of marketable securities | (536) | (1,797) | (4,301)
Sales and maturities of marketable securities | 1,152 | 2,252 | 3,595
Proceeds from Sale of Productive Assets | 32 | 4 | 2
Other investing activities | (118) | (6) | (12)
Net cash used in investing activities | (964) | (1,218) | (1,008)
Cash flows from financing activities: |  |  |
Proceeds from issuance of long-term debt, net of issuance costs | 411 | 0 | 363
Long-term debt payments | (282) | (385) | (1,334)
Common stock repurchases | (137) | 0 | 0
Other financing activities | (139) | 60 | 57
Net cash used in financing activities | (147) | (325) | (914)
Net decrease in cash and cash equivalents | (61) | (125) | (892)
Cash, cash equivalents, and restricted cash at beginning of period | 369 | 494 | 1,386
Cash, cash equivalents, and restricted cash at end of period | 308 | 369 | 494
Cash and cash equivalents | $ 281 | $ 338 | $ 470

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- Definition Amount of cash (inflow) outflow from investing activities classified as other. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-13 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section 45 -Paragraph 12 -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-12 + Details
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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-15 + Details
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- Definition Amount of cash outflow for purchase of marketable security. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481830/320-10-45-11 + Details
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- Definition Amount of cash outflow for the purchase of or improvements to tangible or intangible assets, used to produce goods or deliver services, classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 13 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-13 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 13 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-13 + Details
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- Definition The amount of cash received during the period as refunds for the overpayment of taxes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 25 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-25 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482913/230-10-50-2 + Details
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- Definition The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 14 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-14 + Details
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