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from Mail Online

Did yesterday's mysterious booms hint at military's HYPERSONIC future?

So secret, its existence is not even acknowledged: Futuristic 'Aurora' spy plane that travels at SIX TIMES the speed of sound is blamed for mysterious booms heard at the weekend | In November 2013, Lockheed Martin announced it was developing for its SR-72 spy plane (pictured) said to be able to accelerate up to Mach 6 [Futuristic Airplanes:]

from Naval Open Source INTelligence

Upgrades to Aurora aircraft puts Royal Canadian Air Force on cutting edge of anti-submarine warfare