US airline bonds fell sharply Monday as investors reacted to surging jet fuel prices driven by Middle East tensions. The debt of major carriers weakened across the board, with credit spreads widening as market participants priced in potential earnings pressure. Jet fuel costs have spiked in recent weeks, creating fresh concerns about airline profitability.

Analysts point to the direct link between fuel expenses and airline margins. Fuel typically represents one of the largest operating costs for carriers, often accounting for 20-30% of total expenses. When prices rise sharply, it can quickly erode earnings, especially for airlines operating older, less fuel-efficient fleets. The current price surge comes amid heightened geopolitical uncertainty.

Credit rating agencies are reportedly reviewing airline debt profiles, with downgrades a growing possibility if fuel costs remain elevated. Bond investors are particularly sensitive to these risks, as higher fuel costs can strain debt service capabilities. Some airlines may need to tap credit lines or issue new debt to maintain liquidity, potentially at less favorable terms.