Crossword Genius

Flying at speeds less than sound (8)

Ross

I believe the answer is:

subsonic

(Other definitions for subsonic that I've seen before include "At a speed less than that of sound" , "Of speed lower than that of sound" , "Under 768 mph" , "Travelling at less than Mach 1" , "Less speedy than sound" .)

I've seen this clue in The Guardian.
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