May/44: TOS USAAF. 6 May 1944: First flight, made from Palm Springs Army Air Field, CA. By June/46: Accumulated 144.5 flight hours in 168 flights. June/46 to October/46: Converted to XB-42A by adding a jet engine under each wing. 27 May 1947: First flight as XB-42A at Muroc Air Base, CA. 30 June 1949: Ferried to the Air Force Museum,Wright-Patterson AFB, OH. Ca. October/49: Transported to Paul Garber Restoration Facility, National Air Museum, Suitland, MD. 2010: Transported to the National Museum of the USAF and placed in storage.

5/44: TOS USAAF. 6 May 19444: First flight, made from Palm Springs Army Air Field, CA. By 6/46: Accumulated 144.5 flight hours in 168 flights. 6/46 to 10/46: Converted to XB-42A by adding a jet engine under each wing. 27 May 1947: First flight as XB-42A at Muroc Air Base, CA. 30 June 1949: Ferried to the Air Force Museum,Wright-Patterson AFB, OH. Ca.10/49: Transported to Paul Garber Restoration Facility, National Air Museum, Suitland, MD. 2010: Transported to the National Museum of the USAF and placed in storage.

This was the first of two XB-42 "Mixmaster" a/c built. It first flew on 6 May 1944. The design showed great promise, but the end of WW2 saw the USAAF looking for jet powered designs and XB-42 didn't go into production. In 1946 it was modified with a Westinghouse 19XB-2A podded turbojet under each wing, hence the "A" designation. It was donated to the Smithsonian Museum in 1949, never displayed, and transferred to the USAF Museum in 2010. It is located in the restoration hangar and not on display.