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The sharply swept, delta-winged vehicle concept builds on two decades of Boeing’s experience with the X-43 and X-51A hypersonic demonstrator programs. But it also incorporates design features from other Boeing heritage company high-speed projects including the Mach 3 XB-70 experimental bomber. Like the outwardly similar SR-72 concept revealed in 2013 by Lockheed Martin, the Boeing design also is aimed at a hypersonic successor late in the 2020s to the long-retired SR-71 Blackbird reconnaissance aircraft.
-Boeing states SOB's (Lol) design is derived from experiences with the X-43, X-51, and the XB-70