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Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Cash flows from operating activities: |  |
Net income (loss) | $ (14,274) | $ 14,118
Adjustments to reconcile net income (loss) to net cash flows provided by operating activities: |  |
Depreciation and amortization | 21,028 | 20,470
Stock compensation expense | 716 | 850
Loss on investments, net | 6,462 |
Deferred income taxes | (4,224) | 4,836
Amortization of deferred credits | (213) | (793)
Amortization of debt discount and issuance costs and accretion of interest into long-term debt | 3,199 | 1,860
Gain on extinguishment of debt |  | (950)
Loss on disposal of assets | 5 | 24
Provision for obsolete expendable parts and supplies | 238 | (37)
Changes in assets and liabilities: |  |
Receivables | 248 | (1,700)
Expendable parts and supplies | (978) | 256
Prepaid expenses and other operating assets and liabilities | 2,094 | 4,296
Accounts payable | 174 | (5,723)
Deferred revenue | (4,184) | 53,999
Accrued expenses and other liabilities | (4,868) | (12,637)
Operating lease right-of-use assets and liabilities | (672) | 404
Net cash provided by operating activities | 4,751 | 79,273
Cash flows from investing activities: |  |
Capital expenditures | (19,775) | (1,773)
Investments in equity securities | (200) |
Payments of equipment and other deposits | (6,954) |
Net cash used in investing activities | (26,929) | (1,773)
Cash flows from financing activities: |  |
Proceeds from long-term debt | 30,811 | 195,000
Principal payments on long-term debt and finance leases | (24,510) | (189,131)
Payments of debt and warrant issuance costs | (2,293) | (1,257)
Repurchase of stock | (15) | (19)
Net cash provided by financing activities | 3,993 | 4,593
Net change in cash, cash equivalents and restricted cash | (18,185) | 82,093
Cash, cash equivalents and restricted cash at beginning of period | 123,867 | 102,841
Cash, cash equivalents and restricted cash at end of period | 105,682 | 184,934
Supplemental cash flow information |  |
Cash paid for interest | 2,815 | 6,743
Cash paid for income taxes, net |  | 1
Operating lease payments in operating cash flows | 10,152 | 9,304
Supplemental non-cash operating activities |  |
Right-of-use assets obtained in exchange for lease liabilities | 4,190 | 69
Supplemental non-cash financing activities |  |
Debt issuance costs related to loan agreement with U.S. Department of the Treasury |  | $ (1,887)
Investments in warrants to purchase common stock | 100 |
Accrued capital expenditures | $ 1,722 |

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