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National Security Journal on MSN2d

The North American X-15 ‘Rocket Plane’ Hit Mach 6.7 (All the Way Back in 1967)

Decades before the rumored SR-72 "Darkstar," America had already conquered hypersonic flight with the X-15 rocket plane. -In 1967, this remarkable experimental aircraft, developed by North American ...
National Security Journal on MSN3d

Forget the SR-72 Darkstar: The Mach 5 SR-91 Aurora Rumors Won’t Go Away

Yes, the SR-72 Darkstar gets a lot of attention as the next spy plane. However, years back, the SR-91 was getting some of the ...