Man's gotta do what a man's gotta do..
When you gotta go you gotta go … floor, barf bag, floor … been there (not on a plane though).
This reminds me of a situation I was in, back in the early 90s. I was on an airborne training operation while in the Army out of Ft Bragg NC. It was July and about 95+ Degrees and our flight was being delayed several hours. We had to wait on the side of the tarmac in the hot Carolina sun for hours. Of course we had our 2 1qt canteens and our 2qt canteen to keep hydrated and they provided us with a water Buffalo to refill them if necessary. Having been properly trained on how not to become a heat casualty I was drinking and sweating profusely all afternoon. When we finally got on the Plane packed in like sardines with all our gear, we still had a 3 hour flight before Jump time. Id say about 30 minutes into the flight it hit me and it could not be denied. I grabbed one of my newly emptied canteens and filled it up and left it on the plane under my seat. I can just imagine the look on one of the flight crews or jump masters faces if they found it and decide to take a drink.
This gives new meaning to "Hold ma beer" alert....