Jet B is a distillate covering the naphtha and kerosene fractions. It can be used as an alternative to Jet A-1 but because it is more difficult to handle (higher flammability), there is only significant demand in very cold climates where its better cold weather performance is important.VIATION TURBINE FUEL (JET FUEL) CIVIL JET FUELS Aviation turbine fuels are used for powering jet and turbo-prop engined aircraft and are not to be confused with Avgas.