10 Incredible Facts About The Lockheed SR 71 Blackbird 

10 Incredible Facts About The Lockheed SR 71 Blackbird.
More than a decade after their retirement the Blackbirds remain the world's fastest and highest-flying production aircraft ever built. The Blackbirds were designed to cruise at Mach 3.2, just over three times the speed of sound or more than 2,200 miles per hour and at altitudes up to 85,000 feet.