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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Cash flows from operating activities: |  |  |  |  |  |  |
Net Income (Loss) | $ 194 | $ (131) | $ (431) | $ (232) | $ 460 | $ (877) |
Adjustments to reconcile net income (loss) to net cash provided by operating activities: |  |  |  |  |  |  |
Depreciation and amortization | 99 |  | 105 |  | 294 | 320 |
Stock-based compensation and other |  |  |  |  | 35 | 14 |
Special items - Impairment charges and other | (9) |  | 121 |  | 5 | 350 |
Restructuring Charges | 0 |  | 322 |  | (12) | 322 | $ 220
Changes in certain assets and liabilities: |  |  |  |  |  |  |
Changes in deferred tax provision |  |  |  |  | 95 | (220) |
Increase (Decrease) in Contract with Customer, Liability |  |  |  |  | 152 | 171 |
Increase in deferred revenue |  |  |  |  | 73 | 193 |
Payment for Pension and Other Postretirement Benefits |  |  |  |  | (100) | 0 |
Other - net |  |  |  |  | (101) | (157) |
Net cash provided by operating activities |  |  |  |  | 901 | 116 |
Property and equipment additions: |  |  |  |  |  |  |
Aircraft and aircraft purchase deposits |  |  |  |  | (52) | (61) |
Other flight equipment |  |  |  |  | (78) | (49) |
Other property and equipment |  |  |  |  | (60) | (94) |
Total property and equipment additions, including capitalized interest |  |  |  |  | (190) | (204) |
Purchases of marketable securities |  |  |  |  | (3,413) | (2,092) |
Sales and maturities of marketable securities |  |  |  |  | 2,669 | 1,520 |
Other investing activities |  |  |  |  | (9) | 9 |
Net cash used in investing activities |  |  |  |  | (943) | (767) |
Cash flows from financing activities: |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  |  | 363 | 2,581 |
Common stock repurchases |  |  |  |  | 0 | (31) |
Dividends paid |  |  |  |  | 0 | (45) |
Long-term debt payments |  |  |  |  | (1,222) | (238) |
Other financing activities |  |  |  |  | 34 | 19 |
Net cash provided by (used in) financing activities |  |  |  |  | (825) | 2,286 |
Net increase in cash, cash equivalents, and restricted cash |  |  |  |  | (867) | 1,635 |
Cash, cash equivalents, and restricted cash at beginning of year |  | $ 1,386 |  | $ 232 | 1,386 | 232 | 232
Cash, cash equivalents, and restricted cash at end of the period | 519 |  | 1,867 |  | 519 | 1,867 | 1,386
Cash paid during the period for: |  |  |  |  |  |  |
Interest (net of amount capitalized) |  |  |  |  | 100 | 38 |
Income taxes |  |  |  |  |  | 0 |
Non-cash transactions: |  |  |  |  |  |  |
Right-of-use assets acquired through operating leases |  |  |  |  | 126 | 54 |
Reconciliation of cash, cash equivalents, and restricted cash at end of the period |  |  |  |  |  |  |
Cash and cash equivalents | 495 |  | 1,855 |  | 495 | 1,855 | 1,370
Restricted cash included in Prepaid expenses, assets held-for-sale and other current assets | 24 |  | 12 |  | 24 | 12 |
Total cash, cash equivalents, and restricted cash at end of the period | $ 519 |  | $ 1,867 |  | $ 519 | $ 1,867 | $ 1,386

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