The Hellcat was a fighter plane used by the United States during World War II. It was a single-engine, single-seat aircraft that was designed and manufactured by Grumman Aircraft Engineering Corporation. The Hellcat was one of the most successful fighter planes of the war, with over 12, 000 being produced. It was used in both the Pacific and European theaters of the war, and was credited with shooting down more enemy aircraft than any other Allied fighter plane.