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    3. Have we yet built a supersonic aircraft that exceeds Mach-12?
    Have we yet built a supersonic aircraft that exceeds Mach-12?

    Planes are achiving greater speedsand climbing to higher altitudes, all the time.

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    0  Views: 470 Answers: 1 Posted: 13 years ago
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      1 Answer

      I think the air force has flying saucers and they're just not telling us....http://www.livescience.com/40172-declassified-military-cia-secrets.html


       

      11 years ago. Rating: 5
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