Someone was talking about “top secret” classified Aircraft
(fROM August 3, 2009)
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the SR-91 “Aurora”
The United States government possesses the SR-91 “Aurora” reconnaissance aircraft, though I believe it has been retired. The SR-91 costs almost 1 billion USD per flight and can barely make 5 or 6 Mach only at mesosphere . The SR-71 ran at mach 3.5 at around 80,000 ft altitude. “Aurora” is widely thought to travel at around mach 5 or 6 at 100,000 ft or more. That’s where the atmosphere ends and space begins. Any plane traveling at such speeds and altitude really is a spaceplane.. This aircraft has stealth capabilities far beyond what the United States military currently claims to possess.
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http://godssecret.wordpress.com/2009/08/03/some-was-talking-about-top-secret-classified-aircraft/