The term 'Jet Set Jet' refers to two different types of aircraft. The first is the Learjet, a light business jet manufactured by Bombardier Aerospace. It is a popular choice for private and corporate travel due to its speed and range. The second is the supersonic transport (SST) aircraft, which is capable of flying at speeds greater than the speed of sound. These aircraft are used mainly for military purposes, but some commercial airlines have also operated them in the past. Both the Learjet and SST are examples of the jet set lifestyle, where people travel quickly and in luxury.