The Denver-based airline also issued a third-quarter earnings outlook that surpassed analyst forecasts, signaling continued confidence despite elevated fuel costs. With Spirit's liquidation removing a major source of low-fare capacity, Frontier has been able to increase ticket prices while maintaining strong passenger demand. Higher Fuel Costs Continue To Pressure MarginsCredit: ShutterstockDespite stronger revenue, Frontier continued to face significant cost pressures. Management noted that improving industry pricing has helped offset some of the increase, but fuel remains the company's largest near-term uncertainty. The quarter also highlights a broader shift within the US airline industry.