The High Speed Civil Transport (HSCT), a supersonic airliner, was the focus of the High-Speed Research (HSR) Program, a NASA program to develop the technology needed to design and build a supersonic transport that would be environmentally acceptable and economically feasible. The aircraft was to be a future supersonic passenger aircraft, baselined to cruise at Mach 2.4, or more than twice the speed of sound. The project started in 1990 and ended during 1999. The goal was to employ up-to-date technologies.