Photograph of the wing section of the Learjet 23 prototype, July 23, 1963. Inscription on verso: "P2-A / July 23, 1963 / 8 spars - count 'em for strength far beyond part 3 and part 4B flite [sic] requirements plus fail safe construction due to multi…
Photograph of a man working on the wing section of the Learjet 23 prototype, July 25, 1963. The forward fuselage section is visible in the background.Inscription on verso: "P3-E / July 25, 1963."
Photograph of people attaching the aft and forward fuselage sections of the Learjet 23 prototype, July 31, 1963. Inscription on verso: "P5-H / July 31, 1963 / Attaching aft fuselage section to forward fuselage section."
Photograph of the fuselage of the Learjet 23 prototype, July 31, 1963. Inscription on verso: "P5-E / July 31, 1963 / Showing aft section joined onto forward fuselage."
Photograph of people attaching the wing to the Learjet 23 prototype, August 8, 1963.Inscription on verso: "P6-B / Aug. 8, 1963 / Mating and attaching wing to fuselage."
Photograph of the Learjet 23 prototype at a Lear facility, September 10, 1963. Other aircraft undergoing construction and testing are visible in the background.Inscription on verso: "P 15-E / Sept. 10, 1963."
Photograph of the Learjet 23 prototype at a Lear facility, September 10, 1963. Other aircraft undergoing construction and testing are visible in the background.Inscription on verso: "P 15-D / Sept. 10, 1963."
Photograph of a Learjet 23 aircraft (tail number N801L) by an open hangar, circa October 1963.Typed caption: "First flight of Lear Jet N801L and photograph of the jet as it emerged from the hanger [hangar]."Stamped on verso: "Please return to: Lear…