Used for questions about the Boeing SST, commonly known as the 2707 (although formally the Boeing 733).
The Boeing SST (Supersonic Transport), best known under the name "Boeing 2707" (although its actual boeing model designation was the Boeing [Model] 733), was designed in the 1960s, but never built. It was one of several supersonic airliner designs of its time; however, out of the many SST concepts of the 1960s, only the concorde and tu-144 were built, flown, and placed into service (and the latter only briefly).