Supermarine Spitfire airplane model. Royal Air Force fighter in World War II. The Supermarine Spitfire is a British single-seat fighter aircraft that was used by the Royal Air Force and other Allied countries before, during, and after World War II. Many variants of the Spitfire were built, using several wing configurations. It was also the only British fighter produced continuously throughout the war. The Spitfire continues to be popular among enthusiasts, around 70 remain airworthy.