Jet Fuel is a type of aviation fuel designed for use in aircrafts that have jet-engine. Unleaded/paraffin oil-based fuel classified as JET A-1 is the most common fuel. It is produced to an internationally standardized set of specifications. In America, a version of JET A-1 known as JET A is also used. Another jet fuel that is commonly used in civilian aviation is JET B, which is a fuel in the naptha-kerosene region that is used for its enhanced cold-weather performance. JET B is not much used as its lighter composition makes it more dangerous to handle. It is restricted only to areas where its cold-weather characteristics are absolutely necessary.