What crude oil is used in jet engines?

Jet engines primarily use a refined form of crude oil known as aviation turbine fuel (ATF), which includes Jet A and Jet A-1 types. These fuels are derived from kerosene, a fraction of crude oil, and are specifically designed to meet stringent performance and safety standards required for aviation. The refining process removes impurities and enhances properties like freezing point and combustion efficiency, making them suitable for high-altitude flight.