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Balance Sheet Information | 12 Months Ended
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Sep. 30, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract] |
Balance Sheet Information |
6. | Balance Sheet Information
Certain significant amounts included in the Company's consolidated balance sheet as of September 30, 2019 and 2018, consisted of the following (in thousands):
| September 30, |  |  | September 30, |
| 2019 |  |  | 2018 |
Expendable parts and supplies, net |  |  |  |  |  |  |
Expendable parts and supplies | $ | 25,336 |  |  | $ | 18,907 |
Less obsolescence and other |  | (3,999 | ) |  |  | (3,249 | )
| $ | 21,337 |  |  | $ | 15,658 |
Prepaid expenses and other current assets |  |  |  |  |  |  |
Prepaid aircraft rent | $ | 35,786 |  |  | $ | 30,267 |
Unutilized manufacturer credits |  | — |  |  |  | 4,500 |
Deferred offering and reimbursed costs |  | 2,092 |  |  |  | 1,945 |
Other |  | 3,045 |  |  |  | 4,202 |
| $ | 40,923 |  |  | $ | 40,914 |
Property and equipment—net |  |  |  |  |  |  |
Aircraft and other flight equipment substantially pledged | $ | 1,582,199 |  |  | $ | 1,502,940 |
Other equipment |  | 5,122 |  |  |  | 3,721 |
Leasehold improvements |  | 2,797 |  |  |  | 2,754 |
Vehicles |  | 924 |  |  |  | 692 |
Building |  | 699 |  |  |  | 699 |
Furniture and fixtures |  | 302 |  |  |  | 287 |
Total property and equipment |  | 1,592,043 |  |  |  | 1,511,093 |
Less accumulated depreciation |  | (318,458 | ) |  |  | (260,264 | )
| $ | 1,273,585 |  |  | $ | 1,250,829 |
Other accrued expenses |  |  |  |  |  |  |
Accrued property taxes | $ | 9,186 |  |  | $ | 6,981 |
Accrued interest |  | 4,497 |  |  |  | 6,118 |
Accrued vacation |  | 6,128 |  |  |  | 5,470 |
Accrued wheels, brakes and tires |  | 1,513 |  |  |  | 1,452 |
Other |  | 7,564 |  |  |  | 9,675 |
| $ | 28,888 |  |  | $ | 29,696 |
Depreciation expense totaled $76.2 million, $64.6 million and $60.7 million for the years ended September 30, 2019, 2018 and 2017, respectively. The Company recorded amortization of the unfavorable lease liability amounting to $5.7 million, $6.6 million and $6.8 million for the years ended September 30, 2019, 2018 and 2017, respectively, as a reduction to lease expense. During the year ended September 30, 2019 and 2018 the Company wrote off $0.8 million and $1.2 million of unfavorable lease liability related to the lease termination of its aircraft lease facility with Wells Fargo Bank Northwest, National Association, as owner trustee and lessor (the "GECAS Lease Facility"), which was accounted for as lease termination expense.

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- Definition The entire disclosure for supplemental balance sheet disclosures, including descriptions and amounts for assets, liabilities, and equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -URI http://asc.fasb.org/topic&trid=2122208 + Details
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