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Net (Loss) Earnings Per Share | 9 Months Ended
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Sep. 30, 2025
Net (Loss) Earnings Per Share [Abstract] |
Net (Loss) Earnings Per Share | (15) Net (Loss) Earnings Per Share: The reconciliation of the net (loss) income per common share calculation is as follows:
|  | For the three months ended September 30, |  | For the nine months ended September 30, |
| ($ in millions and shares in thousands, except per share amounts) | 2025 |  | 2024 |  | 2025 |  | 2024 |
| Net loss used for basic and diluted earnings |  |  |  |  |  |  |  |  |  |  |  |
| per share: |  |  |  |  |  |  |  |  |  |  |  |
| Total basic net loss |  |  |  |  |  |  |  |  |  |  |  |
| attributable to Frontier common shareholders | $ | (76) |  | $ | (82) |  | $ | (263) |  | $ | (204) |
| Effect of loss related to dilutive stock units |  | - |  |  | - |  |  | - |  |  | - |
| Total diluted net loss |  |  |  |  |  |  |  |  |  |  |  |
| attributable to Frontier common shareholders | $ | (76) |  | $ | (82) |  | $ | (263) |  | $ | (204) |
| Basic earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
| Total weighted average shares and unvested |  |  |  |  |  |  |  |  |  |  |  |
| restricted stock awards outstanding - basic |  | 250,320 |  |  | 248,986 |  |  | 250,111 |  |  | 247,866 |
| Less: Weighted average unvested restricted stock awards |  | - |  |  | - |  |  | - |  |  | - |
| Total weighted average shares outstanding - basic |  | 250,320 |  |  | 248,986 |  |  | 250,111 |  |  | 247,866 |
| Basic net loss per share |  |  |  |  |  |  |  |  |  |  |  |
| attributable to Frontier common shareholders | $ | (0.30) |  | $ | (0.33) |  | $ | (1.05) |  | $ | (0.82) |
| Diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
| Total weighted average shares outstanding - basic |  | 250,320 |  |  | 248,986 |  |  | 250,111 |  |  | 247,866 |
| Effect of dilutive performance stock awards |  | - |  |  | - |  |  | - |  |  | - |
| Effect of dilutive restricted stock awards |  | - |  |  | - |  |  | - |  |  | - |
| Total weighted average shares outstanding - diluted |  | 250,320 |  |  | 248,986 |  |  | 250,111 |  |  | 247,866 |
| Diluted net loss per share |  |  |  |  |  |  |  |  |  |  |  |
| attributable to Frontier common shareholders | $ | (0.30) |  | $ | (0.33) |  | $ | (1.05) |  | $ | (0.82) |
In calculating diluted net loss per common share, the effect of certain outstanding RSUs and PSUs has been excluded from the computation as the effect would be antidilutive. For both the three and nine months ended September 30, 2025, RSUs of approximately 1,011,000, and PSUs of approximately 1,008,000 and 813,000, respectively, have been excluded. In calculating diluted net loss per common share, the effect of certain outstanding RSUs and PSUs has been excluded from the computation as the effect would be antidilutive. For the three and nine months ended September 30, 2024, RSUs of approximately 928,000 and 1,085,000, respectively, and PSUs of approximately 237,000 and 196,000, respectively, have been excluded.

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