On the apron at Valiant Air Command Warbird Museum. NASA flew variants of the Learjet for airborne astronomy including the Model 23, which was equipped with a 12-inch infrared telescope to study Venus. A little over hundred Model 23s were built between 1964-66, with this aircraft being built in 1965. The Lear 23 was powered by a pair of 12.7 kN GE CJ610-4 turbojets that could get the business jet to Mach 0.82 because of the high power-to-weight ratio. Thanks to the designs of the prodigious Bill Lear, Model 23 was soon surpassed in performance and comfort by the Learjet Model 24 and 25.

First registered N788DR and flying with many corporate operators over the years, it appears this Learjet never actually served NASA