Short of misting it throughout the plane via the air conditioning, I can't think of anything else they could do to get any more alcohol into the passengers
Stop giving them ideas.
I have been told (never tried it) that if you are in a sauna and pour vodka over the stones, it does just that. Into the lungs, into the bloodstream. Apparently you can go from sober to out of your tree in almost a matter of seconds. "I sure picked a hell of a day to give up sniffing glue"