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The SC could go supersonic. At worst case, it could climb to altitude and do a slight power dive to punch through Mach 1; it could then level off and cruise at slightly supersonic. A passenger liner would be less likely to do such a thing than a military craft. If it might be rated to fly at high subsonic at low altitude like the B-1, where winds and maneuvers would try to shake it to bits, then it could handle the power dive.