The North American XB-70 Valkyrie, the Mach Three Bomber That Rode Its Own Shockwave, and the Dayton Hangar That Holds the Only Airframe Left After the Mojave Took the Other One
North American's XB-70 Valkyrie flew at Mach 3 riding its own shockwave, was cancelled before combat, and only one of two airframes survives today.
Taildragger