Aircraft like the F35 and Harrier can hover, so 0 km/h
Gossamer Albatross is a human powered plane with a top speed of 29 km/h.
The Wright Flyer averaged about 11 km/h.
Planes with custer wings can fly very slowly since they use the engines to blow air over the wings to create more lift. They can fly at 18 km/h, but become dangerous if an engine fails. https://en.wikipedia.org/wiki/Custer_CCW-5
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