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On the one hand, disgusting.

On the other hand, I'm not surprised.

I've seen people take off their shoes and sit barefoot (no socks, either) on the carpet - do they not think of what was there before?

Why the hell are there even carpets in airplanes? Give me a nice shiny surface that can be easily wiped with a mop between flights any day (though that would probably never happen anyway), like the sort of floors hospitals or cleanrooms/graded areas have.