Calspan purchased their first Gulfstream III aircraft (N710CF) in 2011 when customers expressed a need for a systems testbed with Learjet performance in a larger airframe and to support Northrop Grumman's Next-Generation Jammer flight test program. The aircraft was modified into a systems test aircraft with engineer stations in the cabin, a reconfigurable antenna base on the top of the external fuselage, a testbed power distribution system. In 2016, Calspan added a second Gulfstream III (N721CF) to support additional contracts. It's now retired at Niagara Falls Airport without engines.

Calspan Aerospace acquired this Learjet 24D in 1979. It was then modified into a variable stability aircraft and after completion in 1981 entered service first at the U.S. Naval Test Pilot School and the U.S. Air Force Test Pilot School. In October, 2017, Calspan acquired a Learjet 31A to be used as a new VSS (Variable Stability System) aircraft to replace the Learjet 24D which is now retired and stored behind the Calspan hangar at Niagara Falls International Airport (KIAG/IAG).

Taken up in March 1955 by the USAF as standard C-131B 53-7793, this Convair was later used at Griffiss AFB, NY as a radar test-bed and after being contracted out to Calspan of Buffalo, NY in Dec 1966, was redesignated as an NC-131B. It was re-engined with Allison turboprops at Burbank and made its first flight as NC-131H Total In-Flight Simulator in July 1970. During a long career, the unique TIFS simulated the flight characteristics of many aircraft in development, including the X-40, Tacit Blue, Space Shuttle, B-2, YF-23, C-17, SST, MD-12X and Indonesia's N-250. Ferried to NMUSAF in Nov 2008

Modified variable stability (as the registration recalls) Learjet, used to simulate the flight characteristics of various aircraft.

Constructed as a C-131B and taken on strength with the US Air Force with serial 53-7793 in 1955 it was used as a radar testbed. In 1966, the aircraft was transferred to Calspan, Buffalo (NY) and redesignated NC-131B. From December 1968 to 1970 it was converted to an NC-131H, its engines changed from piston radials to Allison 501-D-13 turbo-props, made its first flight as a Total Flight-In Simulator (TIFS) in 1970. After various projects it was handed over to Calspan as N793VS on 23 December 2003. To the USAF Museum in Wright-Patterson on 7 November 2008.

Here for a week doing training.

Arrived the day before, was prepared for departure and then unloaded again with engines being covered.

Calspan Corporation's Flight Research division Strike Saab works for the Naval Air Warfare Command testing and training in the (ASTARS II (Airborne Systems Training and Research Support) program.