Lockheed Martin's hypersonic aircraft plans are taking shape
 

For years, Lockheed Martin has been working on hypersonic (Mach 5 and above) aircraft like the SR-72, which could reach virtually any part of the world within a couple of hours. These vehicles have long been seen as distant prospects (the SR-72 migh...

http://www.engadget.com/2016/03/26/l...onic-aircraft/