Is Frontier Group Stock a Buy, Sell, or Hold for September 2025?

Group 1 - Frontier Airlines experienced a significant stock price increase of 15% on Tuesday and ended the week approximately 10% higher, indicating sustained investor interest [1][2] - The key catalyst for this stock movement is the ongoing challenges faced by rival Spirit Airlines, which is undergoing its second bankruptcy in a short period [3][4] - As Spirit reduces its routes, Frontier is positioned to capture market share, potentially leading to increased pricing power and higher margins over time [4][5] Group 2 - The ultra-low-cost carrier model is beneficial for consumers by providing affordable travel options and driving down prices across the airline industry [6] - However, rising input costs due to inflationary pressures may challenge Frontier's ability to maintain low fares while managing profitability [7]