If someone did want to assassinate lil X as he flew on a plane, they would simply buy a radio and listen in to his pilot, who is constantly "doxxing" Musk in real time, every minute of every day, as he talks to air traffic control. Why would you rely on some kid posting to social media very inaccurate and second-hand information, when you could just listen in to his coordinates broadcasting live on the radio, or at least install an app such as Flightly?