Marrying an American dive-bomber design and a British engine, the North American P-51 Mustang became one of the greatest fighters of World War II. The iconic P-51 was a World War II single-seat fighter and fighter-bomber that also saw service in the Korean War and other conflicts. The Mustang was designed in 1940 by North American Aviation (NAA) in response to a requirement of the British Purchasing Commission. The Purchasing Commission approached North American Aviation to build Curtiss P-40 fighters under license for the Royal Air Force (RAF). Rather than build an old design from another company, North American Aviation proposed the design and production of a more modern fighter. The prototype NA-73X airframe was rolled out on 9 September 1940, 102 days after the contract was signed, and first flew on 26 October. The Mustang was designed to use the Allison V-1710 engine, which had limited high-altitude performance in its earlier variants. The aircraft was first flown operationally by the RAF as a tactical-reconnaissance aircraft and fighter-bomber (Mustang Mk I). Replacing the Allison with a Rolls-Royce Merlin resulted in the P-51B/C (Mustang Mk III) model and transformed the aircraft's performance at altitudes above 15,000ft, without sacrificing range, allowing it to compete with the Luftwaffe's fighters. The definitive version, the P-51D, was powered by the Packard V-1650-7, a license-built version of the two-speed two-stage-supercharged Merlin 66 and was armed with six .50 calibre M2/AN Browning machine guns. From late 1943, P-51Bs and P-51Cs (supplemented by P-51Ds from mid-1944) were used by the USAAF's Eighth Air Force to escort bombers in raids over Germany, while the RAF's Second Tactical Air Force and the USAAF's Ninth Air Force used the Merlin-powered Mustangs as fighter-bombers, roles in which the Mustang helped ensure Allied air superiority in 1944. The P-51 was also used by Allied air forces in the North African, Mediterranean, Italian and Pacific theatres, and during World War II, Mustang pilots claimed to have destroyed some 4,950-enemy aircraft. At the start of the Korean War, the Mustang, by then redesignated F-51, was the main fighter of the United Nations until jet fighters, including North American's F-86, took over this role, the Mustang then became a specialised fighter-bomber. Despite the advent of jet fighters, the Mustang remained in service with some air forces until the early 1980s. In Model Aircraft Extra #4, some 15 P-51 Mustang build projects will be included, in a ‘how-to’ format, and continue this fantastic series modelling guides from MA Publications, the new name in scale modelling.