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Net (Loss) Income Per Common Share | 12 Months Ended
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Dec. 31, 2024
Net (Loss) Income Per Common Share [Abstract] |
Net (Loss) Income Per Common Share | (15) Net (Loss) Income Per Common Share: The reconciliation of the net (loss) income per common share calculation is as follows:
|  |  | For the year ended |  | For the year ended |  | For the year ended |
| ($ in millions and shares in thousands, |  | December 31, |  | December 31, |  | December 31, |
| except per share amounts) |  | 2024 |  | 2023 |  | 2022 |
| Net (loss) income used for |  |  |  |  |  |  |  |  |  |
| basic and diluted earnings per share: |  |  |  |  |  |  |  |  |  |
| Net (loss) income attributable to Frontier common shareholders |  | $ | (322) |  | $ | 29 |  | $ | 441 |
| Less: Dividends paid on unvested restricted stock awards |  |  | - |  |  | - |  |  | - |
| Total basic net income attributable to |  |  |  |  |  |  |  |  |  |
| Frontier common shareholders |  | $ | (322) |  | $ | 29 |  | $ | 441 |
| Effect of loss related to dilutive stock units |  |  | - |  |  | - |  |  | - |
| Total diluted net (loss) income attributable to |  |  |  |  |  |  |  |  |  |
| Frontier common shareholders |  | $ | (322) |  | $ | 29 |  | $ | 441 |
| Basic earnings per share: |  |  |  |  |  |  |  |  |  |
| Total weighted average shares and |  |  |  |  |  |  |  |  |  |
| unvested restricted stock awards outstanding - basic |  |  | 248,184 |  |  | 245,517 |  |  | 244,781 |
| Less: Weighted average unvested restricted stock awards |  |  | - |  |  | - |  |  | - |
| Total weighted average shares outstanding - basic |  |  | 248,184 |  |  | 245,517 |  |  | 244,781 |
| Basic net (loss) income per share attributable |  |  |  |  |  |  |  |  |  |
| to Frontier common shareholders |  | $ | (1.30) |  | $ | 0.12 |  | $ | 1.80 |
| Diluted earnings per share: |  |  |  |  |  |  |  |  |  |
| Total weighted average shares outstanding - basic |  |  | 248,184 |  |  | 245,517 |  |  | 244,781 |
| Effect of dilutive units |  |  | - |  |  | 2,330 |  |  | - |
| Effect of dilutive restricted stock awards |  |  | - |  |  | 612 |  |  | 499 |
| Effect of dilutive performance stock awards |  |  | - |  |  | - |  |  | - |
| Total weighted average shares outstanding - diluted |  |  | 248,184 |  |  | 248,459 |  |  | 245,280 |
| Diluted net (loss) income per share attributable to Frontier common shareholders |  | $ | (1.30) |  | $ | 0.12 |  | $ | 1.80 |
In calculating diluted net loss common share for the years ended December 31, 2024, the effect of certain outstanding RSUs and PSUs has been excluded from the computation as the effect would be antidilutive. For the year ended December 31, 2024, RSUs of approximately 1,255,000 and PSUs including those converted to performance-based restricted stock of approximately 326,000, respectively have been excluded. In calculating diluted net income per common share for the years ended December 31, 2023, and 2022, the effect of certain PSUs is excluded from the computation as the respective performance metrics have not been satisfied.

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