When the European Union enacted a new regulation in 2017 to allow Commercial Air Transport (CAT) operations using Single Engine Turbine (SET) aircraft, many in the industry thought that at last something that had grown solidly in the United States and some other countries since the 1990s would add a new dimension in Europe, adding considerably to connectivity and boosting the economic contribution of such aircraft – produced by manufacturers such as Pilatus, Piper and Textron.