While "joining the Mile High Club" is not a specific criminal offense in and of itself, the acts required to do so often fall under broader laws regarding public indecency or disorderly conduct. Most countries, including the U.S. and the UK, classify an aircraft cabin—including the lavatory—as a public space. Engaging in sexual activity in a plane bathroom can technically lead to charges of "indecent exposure" or "lewd acts in public." However, the most common way people get into legal trouble is by failing to follow crew member instructions. If a flight attendant asks you to stop or leave the lavatory and you refuse, you are violating federal aviation laws regarding "interfering with a flight crew," which is a serious felony that can result in arrest upon landing and massive fines. In 2026, with increased cabin surveillance and "zero-tolerance" policies for disruptive behavior, most airlines will ban passengers for life if they are caught, even if local police choose not to file formal criminal charges.