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Net (Loss) Earnings Per Share | 6 Months Ended
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Jun. 30, 2025
Net (Loss) Earnings Per Share [Abstract] |
Net (Loss) Earnings Per Share | (14) Net (Loss) Earnings Per Share: The reconciliation of the net (loss) income per common share calculation is as follows:
|  | For the three months ended ‎June 30, |  | For the six months ended ‎June 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 | $ | (123) |  | $ | (123) |  | $ | (187) |  | $ | (122) |
| Effect of loss related to dilutive stock units |  | - |  |  | - |  |  | - |  |  | - |
| Total diluted net loss |  |  |  |  |  |  |  |  |  |  |  |
| attributable to Frontier common shareholders | $ | (123) |  | $ | (123) |  | $ | (187) |  | $ | (122) |
| Basic earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
| Total weighted average shares and unvested |  |  |  |  |  |  |  |  |  |  |  |
| restricted stock awards outstanding - basic |  | 250,259 |  |  | 248,754 |  |  | 250,019 |  |  | 247,382 |
| Less: Weighted average unvested restricted stock awards |  | - |  |  | - |  |  | - |  |  | - |
| Total weighted average shares outstanding - basic |  | 250,259 |  |  | 248,754 |  |  | 250,019 |  |  | 247,382 |
| Basic net loss per share |  |  |  |  |  |  |  |  |  |  |  |
| attributable to Frontier common shareholders | $ | (0.49) |  | $ | (0.49) |  | $ | (0.75) |  | $ | (0.49) |
| Diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
| Total weighted average shares outstanding - basic |  | 250,259 |  |  | 248,754 |  |  | 250,019 |  |  | 247,382 |
| Effect of dilutive performance stock awards |  | - |  |  | - |  |  | - |  |  | - |
| Effect of dilutive restricted stock awards |  | - |  |  | - |  |  | - |  |  | - |
| Total weighted average shares outstanding - diluted |  | 250,259 |  |  | 248,754 |  |  | 250,019 |  |  | 247,382 |
| Diluted net loss per share |  |  |  |  |  |  |  |  |  |  |  |
| attributable to Frontier common shareholders | $ | (0.49) |  | $ | (0.49) |  | $ | (0.75) |  | $ | (0.49) |
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 six months ended June 30, 2025, RSUs of approximately 1,043,000 and 981,000, respectively, and PSUs of approximately 898,000 and 763,000 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 six months ended June 30, 2024, RSUs of approximately 629,000 and 878,000, respectively, and PSUs of approximately 149,000 and 134,000, respectively, have been excluded.

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