The Northrop F-5A/B Freedom Fighter and F-5E/F Tiger II are part of a family of widely used light supersonic fighter aircraft, designed and built by Northrop in the United States. Hundreds remain in service in air forces around the world in the early 21st Century, and the type has also been the basis for a number of other aircraft. The first F-5E flew on August 11, 1972. The improved second-generation F-5E Tiger II was also primarily used by American Cold War allies and, in limited quantities, served in US military aviation as a training and aggressor aircraft. The Airworld F5 is an incredibly good and gently flier and therefore suited for Jet newcomers, as well.