Which type of fuel is commonly used in commercial jet engines?

Commercial jet engines primarily utilize Jet A fuel due to its specific properties that are well-suited for high-altitude and high-performance environments. Jet A is a kerosene-based fuel that has a high flash point, which contributes to safety by reducing the risk of ignition in operating conditions. The fuel's low freezing point also makes it ideal for high-altitude flights, where temperatures can plunge significantly.

Additionally, Jet A undergoes rigorous quality control and is standardized for use in jet engines, ensuring consistency in performance and reliability. This fuel is designed to minimize the potential for corrosion and to have good thermal stability, which is crucial for the operational integrity of aircraft engines during prolonged use.

While other fuels like JP-4, natural gas, and avgas are utilized in specific aviation and automotive contexts, they do not have the widespread applicability and performance characteristics required for commercial jet operations that Jet A provides.