AAmericAAn AAirlines -- the home of the endless droning announcements -- makes the same annoucement (ad nauseum) and a flight attendant told me it was, indeed, an FAA rule. she said that the FAA have caught people trying to break through the bathroom wall that is shared with the cockpit now that the cockpit door is secured. limiting access to that bathroom is an FAA priority, the AAtendAAnt told me.