Has Lockheed Martin FINISHED building the secret hypersonic successor to the Blackbird? Skunkworks boss hints unmanned SR-72 bomber has ‘already been made’ – DailyMail

Envisioned as an unmanned aircraft, the SR-72 would fly at speeds up to Mach 6, or six times the speed of sound, Lockheed Martin has said previously.

via SR-72 hypersonic bomber ‘has already been made’ | Daily Mail Online