McDonnell XP-67 Moonbat is a project of a twin-engine fighter, implemented in the interests of the US Army Air Corps in the first half of the 1940s. The first plane developed by the McDonnell Aircraft Corporation.The fighter was designed to perform high-speed, high-altitude air combat with the potential to intercept German long-range bombers. Its main advantage was advanced aerodynamics, which, coupled with powerful engines, was supposed to give the plane the best performance among piston aircraft. However, the large number of problems that followed the risky design led to a significant delay in the project.As a result, already by the end of World War II, with the loss of the prototype, it was decided that the aircraft, for all its merits, was unpromising and the military directed resources to the creation of new jet fighters. The MoonBat project was closed.