Clarence Leonard "Kelly" Johnson was an American aeronautical and systems engineer. He is recognized for his contributions to a series of important aircraft designs, most notably the Lockheed U-2 and
Johnson, c. 1975
Kelly Johnson and Gary Powers in front of a U-2.
Kelly Johnson participated in the design of the Lockheed Model 10 Electra, testing a model with a single vertical stabilizer in the wind tunnel of the University of Michigan.
A design of the Lockheed A-3 (Mach 3 ramjet), sketch from Johnson's notebook
The Lockheed SR-71 "Blackbird" is a retired long-range, high-altitude, Mach 3+ strategic reconnaissance aircraft that was developed and manufactured by the American aerospace company Lockheed Corporat
Kelly Johnson (engineer)
…aeronautical and systems engineer. He is recognized for his contributions to a series of important aircraft designs, most notably the Lockheed U-2 and SR-71 Blackbird. Besides the first production aircraft to exceed Mach 3, he also produced the first fighter capable of Mach 2, the United States' first operational jet…
SR-71 Blackbird assembly line at Skunk Works
No-step areas are outlined in red on the SR-71A at the Museum of Aviation, Robins AFB. Operational aircraft had the words NO STEP to indicate to which side of the line the warning applied.