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MERGER WITH MESA AIR GROUP, INC. - Schedule of Purchase Price Consideration (Details) $ / shares in Units, $ in Millions | Nov. 25, 2025 USD ($) $ / shares shares | Mar. 31, 2026 shares | Dec. 31, 2025 shares | Nov. 24, 2025 shares
--- | --- | --- | --- | ---
Business Combination [Line Items] |  |  |  |
Common stock, shares outstanding (in shares) |  | 45,604,180 | 45,713,286 |
Republic Airways Holdings Inc. |  |  |  |
Business Combination [Line Items] |  |  |  |
Common stock, shares outstanding (in shares) | 46,949,601 |  |  |
Exchange Ratio | 38.9933 |  |  |
Price per share at fair value (in dollars per share) | $ / shares | $ 21.00 |  |  |
Implied enterprise value | $ | $ 985.9 |  |  |
Equity Merger consideration at fair value | $ | 117.5 |  |  |
Other consideration at fair value | $ | 2.7 |  |  |
Total Merger consideration | $ | $ 120.2 |  |  |
Republic Airways Holdings Inc. | Legacy Republic |  |  |  |
Business Combination [Line Items] |  |  |  |
Common stock, shares outstanding (in shares) | 1,025,264 |  |  | 1,004,108
Republic equity relinquished | 11.90% |  |  |
Republic Airways Holdings Inc. | Legacy Republic | Restricted Stock Units (RSUs) |  |  |  |
Business Combination [Line Items] |  |  |  |
Shares issued in period (in shares) | 21,156 |  |  |
Republic Airways Holdings Inc. | Legacy Republic | Restricted Stock |  |  |  |
Business Combination [Line Items] |  |  |  |
Shares issued in period (in shares) | 1,264,210 |  |  |
Republic Airways Holdings Inc. | Mesa Air Group, Inc. |  |  |  |
Business Combination [Line Items] |  |  |  |
Common stock, shares outstanding (in shares) | 2,853,542 |  |  | 2,792,531
Resulting shares of Mesa common stock issued for Republic shares outstanding (in shares) | 39,978,395 |  |  |
Shares of common stock of Mesa before the application of the Three Party Agreement (in shares) | 44,096,147 |  |  |
Mesa common stock issued in accordance with the Three Party Agreement (6.0% of the total Mesa shares of common stock at closing of the Merger) (in shares) | 2,853,454 |  |  |
Escrow shares held, percent | 6.00% |  |  |
Republic Airways Holdings Inc. | Mesa Air Group, Inc. | Restricted Stock Units (RSUs) |  |  |  |
Business Combination [Line Items] |  |  |  |
Shares issued in period (in shares) | 61,011 |  |  |

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