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People use lavs not assigned to them on domestic airlines every time I fly, so I can only imagine something else was going on. Occasionally flight attendants ask nicely to return to the economy cabin but if someone pulls a Kristen Wiig a la Bridesmaids, then all bets are off, as we are constantly reminded, federal law requires us to obey crew instructions International airlines are much more strict about restricting business and first class lav access.