“After Years of Silence, We Finally Know More About the SR-71 Blackbird’s Successor – – Lockheed Martin’s Advanced Development Programs, or Skunk Works, discussed the future of the SR-72, a Mach 6 strike and reconnaissance aircraft.”

http://www.popularmechanics.com/military/aviation/a26796/hypersonic-sr-72-aircraft/?src=socialflowFB

My father will find this interesting.

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