The 420th Flight Test Flight (420 FLTF) is an inactive United States Air Force Reserve squadron. It was last assigned to the 413th Flight Test Group of Air Force Reserve Command at Phoenix-Mesa Gateway Airport, Arizona, where it was inactivated on 31 October 2007. The flight was first active during World War II as the 420th Night Fighter Squadron. The squadron served from 1943 to 1944 as an Operational Training Unit for night fighter aircrews.