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(Loss)/Earnings Per Share (Tables) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2025 | Sep. 30, 2024
Earnings Per Share [Abstract] |  |
Calculations of Net (Loss)/Earnings Per Common Share | Calculations of net (loss)/earnings per common share were as follows (in thousands, except per share amounts):
|  | Three Months Ended June 30, |  |  | Nine Months Ended June 30, |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Net income/(loss) |  | $ | 20,856 |  |  | $ | (19,908 | ) |  | $ | (152,332 | ) |  | $ | (66,097 | )
Basic weighted average common shares outstanding |  |  | 41,439 |  |  |  | 41,217 |  |  |  | 41,368 |  |  |  | 41,075 |
Diluted weighted average common shares outstanding |  |  | 41,683 |  |  |  | 41,217 |  |  |  | 41,368 |  |  |  | 41,075 |
Net (loss)/income per common share attributable to Mesa Air Group: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.50 |  |  | $ | (0.48 | ) |  | $ | (3.68 | ) |  | $ | (1.61 | )
Diluted |  | $ | 0.50 |  |  | $ | (0.48 | ) |  | $ | (3.68 | ) |  | $ | (1.61 | )
| Calculations of net loss per common share were as follows (in thousands, except per share data):
|  | Year Ended September 30, |
|  | 2024 |  |  | 2023 |  |  | 2022 |
Net loss |  | $ | (91,015 | ) |  | $ | (120,116 | ) |  | $ | (182,678 | )
Basic weighted average common shares outstanding |  |  | 41,137 |  |  |  | 39,465 |  |  |  | 36,133 |
Diluted weighted average common shares outstanding |  |  | 41,137 |  |  |  | 39,465 |  |  |  | 36,133 |
Net loss per common share attributable to Mesa Air Group: |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | (2.21 | ) |  | $ | (3.04 | ) |  | $ | (5.06 | )
Diluted |  | $ | (2.21 | ) |  | $ | (3.04 | ) |  | $ | (5.06 | )
Number of Weighted-Average Potentially Dilutive Shares Excluded from Calculation of Diluted Net Loss Per Share | The following number of weighted-average potentially dilutive shares were excluded from the calculation of diluted net loss per share because the effect of including such potentially dilutive shares would have been anti-dilutive:
|  | Three Months Ended June 30, |  |  | Nine Months Ended June 30, |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Warrants |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Restricted stock |  |  | — |  |  |  | — |  |  |  | 106 |  |  |  | — |
|  |  | — |  |  |  | — |  |  |  | 106 |  |  |  | — |
| The following number of weighted-average potentially dilutive shares (in thousands) were excluded from the calculation of diluted net loss per share because the effect of including such potentially dilutive shares would have been anti-dilutive:
|  | Year Ended September 30, |
|  | 2024 |  |  | 2023 |  |  | 2022 |
Warrants |  |  | — |  |  |  | — |  |  |  | 758 |
Restricted stock |  |  | — |  |  |  | — |  |  |  | 106 |
|  |  | — |  |  |  | — |  |  |  | 864 |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
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