Lockheed SR-71 Blackbird
No reconnaissance aircraft in history has operated globally in more hostile airspace or with such complete impunity than the SR-71, the world’s fastest jet-propelled aircraft.
https://airandspace.si.edu/collection-objects/lockheed-sr-71-blackbird/nasm_A19920072000
My grandfather worked on these before LBJ leaked their existence to the public.