Dassault’s plans for a supersonic business jet are still pretty much alive. The French manufacturer is leading a European research project called Hisac, which stands for hi-speed aircraft. Three families are being studied. Shown on the pictures below are the three configurations partner Sukhoi is studying in the low-boom (differential pressure below 15 Pa) family. Other specifications include a 4,000-nm range, a Falcon 50-sized cabin for eight passengers and a Mach 1.6 speed.