We’ll continue with the design concepts of the Lockheed company and Kelly Johnson. These designs set the company and the man so far apart from their contemporaries at that time, that to this day in one design alone that gap has still not been breached. The SR-71 Blackbird planes were so secret it is only with the benefit of time that we can now look back in awe of their achievements. Even then we will probably never know all they were capable of.