Core Viewpoint - Airline stocks have risen as major US carriers report strong travel demand, which is helping to mitigate the impact of rising fuel costs due to geopolitical tensions in the Middle East [1][2]. Airline Performance - Delta Air Lines reported that travel demand remains robust, with both corporate and leisure segments showing strength, leading to a nearly 5% increase in its shares during premarket trading [2]. - JetBlue Airways and Frontier Airlines also saw gains of about 2% and 3%, respectively, while American Airlines and Southwest Airlines rose approximately 4% and 3% [2]. - The sector had previously experienced a selloff due to concerns over profitability from higher oil prices, but has begun to stabilize as oil prices eased slightly [3][11]. Revenue Outlook - Delta raised its first-quarter revenue growth outlook to the high-single-digit percentage range, up from an earlier forecast of 5% to 7% [4][5]. - American Airlines now expects year-over-year sales growth of over 10%, an increase from its previous guidance of 7% to 10% [5]. - JetBlue also increased its unit revenue growth expectations for the quarter to 5% to 7%, up from flat to 4% [8]. Cost Pressures - Despite strong demand, airlines are facing rising operational costs due to increased jet fuel prices, which have surged more than 50% since late February, reaching between $150 and $200 per barrel [13]. - Fuel costs typically account for 20% to 25% of operating expenses, raising concerns about profit margins as the summer travel season approaches [14]. Pricing Power - Investors are closely monitoring whether airlines can pass on higher fuel costs to consumers through fare increases without negatively impacting demand [15]. - Airlines generally maintain about two weeks of fuel inventory, providing a short-term buffer against price spikes, but the long-term impact remains uncertain if elevated fuel costs persist [16].