“The Boeing 2707 was developed as the first American supersonic transport (SST). The SST was the topic of considerable concern within and outside the aviation industry.
“From the start the airline industry had noted that the economics of the design were questionable, concerns that were only partially addressed during development. Outside the field, the entire SST concept was the subject of considerable negative press, centered on the issue of sonic booms and effects on the ozone layer.
“Rising costs and the lack of a clear market led to its cancellation in 1971 before two prototypes had been completed.
“The Museum of Flight in Seattle parks its Concorde a few blocks from the building where the original 2707 mockup was housed in Seattle.”