Boeing YB-40 Flying Fortress Boeing YB-40 Flying Fortress The Boeing YB-40 Flying Fortress was a modification for operational testing purposes of the B-17 Flying Fortress bomber aircraft, converted to act as a heavily armed gunship for other bombers during World War II. At the time of its development, long-range fighter aircraft such as the North American P-51 Mustang were just entering quantity production, and thus were not yet available to accompany bombers all the way from England to Germany and back. Work on the prototype, Project V-139, began in September 1942 by converting the second production B-17F-1-BO (serial number 41-24341) built. Conversion work was
37th Flying Training Wing (World War II) 37th Flying Training Wing (World War II) The 37th Flying Training Wing is an inactive United States Army Air Forces unit. It was last assigned to the Western Flying Training Command, and was disbanded on 16 June 1946 at Luke Field, Arizona. There is no lineage between the United States Air Force 37th Training Wing, established on 22 December 1939 as the 37th Pursuit Group (Interceptor) at Albrook Army Airfield, Panama Canal Zone, and this organization. The wing directed Training Command Flight Schools in Arizona. Most the assigned schools provided phase II basic and phase II advanced flying training for