“…Variations in longitudinal handling qualities were made possible by the conversion to variable-stability airplanes of a Douglas B-26 [22] in 1950 and a Lockheed F-94A [23] in 1953 by CAL for the USAF, and a YF-86-D by NACA Ames in 1957. [24] NACA Ames and CAL [25] In addition to their uses for research in handling qualities, the in-flight simulators took on a role of simulating real aircraft designs prior to first flight. The list of aircraft that have been simulated is too long to document here, but it is impressive both in diversity and number, and continues to grow.…”