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Nature of Operations and Summary of Significant Accounting Policies Property and Equipment (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Jun. 30, 2025
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Property, Plant and Equipment [Abstract] |  |
Accumulated Depreciation, Property and Equipment | $ 499,855 | $ 499,928
Assets held for sale | 11,346 | 5,606
Air Transportation Equipment |  |
Assets held for sale | 2,070 | $ 5,606
Building |  |
Assets held for sale | $ 9,276 |

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