MERGER WITH MESA AIR GROUP, INC. - Schedule of Recognized Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025	Nov. 25, 2025
Assets acquired:
Goodwill	$ 122.5	$ 122.5
Republic Airways Holdings Inc.
Assets acquired:
Cash and cash equivalents			$ 19.6
Inventories			19.5
Property and equipment			22.6
Deferred income taxes			19.0
Goodwill			120.4
Other non-current assets			8.9
Total assets acquired			250.2
Liabilities assumed:
Operating lease liability			6.6
Other non-current liabilities			1.0
Total liabilities assumed			130.0
Net assets acquired			120.2
Republic Airways Holdings Inc. | Nonrelated Party
Assets acquired:
Other current assets			14.5
Liabilities assumed:
Accounts payable			55.3
Accrued expenses and other current liabilities			65.9
Republic Airways Holdings Inc. | Related Party
Assets acquired:
Other current assets			25.7
Liabilities assumed:
Accounts payable			0.7
Accrued expenses and other current liabilities			$ 0.5