Atlantis 1/400 Boeing SST Kit M6815Atlantis 1 400 Boeing SST Kit M6815 The Boeing 2707 was an American supersonic passenger airliner project during the 1960s. Boeing won a competition for a government funded contract to build an American supersonic airliner. The design emerged as a large aircraft with seating for 250 to 300 passengers and cruise speeds of approximately Mach 3. It was intended to be much larger and faster than competing supersonic transport (SST) designs such as the