You heard this from an idiot. Planes do not fly through severe turbulence all the time. The fact is they hardly ever fly through severe turbulence. Planes divert, even for moderate turbulence, if they can. And the smart ones turn around in the face of severe turbulence. (Just in case you don't know, severe turbulence is when unsecured items will fly around the interior of the plane. I've never encountered this on any flight, private or commercial.)
ML/NJ
Maybe they fly over it? Not sure.
I’m not leaping to the conclusion that it was a bomb, just saying that I wouldn’t neccessarily poo poo the idea.