Built as a 377 and delivered to Pan American World Airways in September 1949 as N1038V. Initially it was named Clipper Constitution, later renamed Clipper Hotspur. Withdrawn from use and stored at New York in 1960. To Boeing, (August 1960), Lee Mansdorf & Co. (October 1960) and Aero Spacelines (1963), where it was converted to a 377SGT. By August 1965 it was registered N1038V again. In September 1965, the aircraft was involved in an incident at/near Mojave (CA); the airframe failed in-flight (while cruising). The factors included separation in flight and damage was substantial. The aircraft was able to make an emergency landing and there were no fatalities. NASA have had 2 377's registered as N940NS, the other one being c/n 16724.