Boeing showed its concept for a Mach 5 hypersonic demonstrator at the American Institute of Aeronautics and Astronautics SciTech forum and Guy Norris of Aviation Week has the details.
By TSgt. Michael Haggerty, USAF (U.S. DefenseImagery photo VIRIN: DF-ST-89-06281) [Public domain], via Wikimedia Commons
Company officials told Aerospace Daily that the vehicle is based on Boeing’s experience with the X-43 and X-51A projects and includes input from the XB-70 program.
More details in the link below.