communicates zeta from the airplane to air traffic control. it was shut off at 1:21 a.m. two minuteses after the co pilot last communicated, it was shut down either intentionally or by the mechanical failure, do you believe that that information could tell air traffic control that the plane had already turned? would they be able to look at that today and say, this airplane had already made its u-turn at 1:07 a.m., i see it right here? yes, i do. and also, when the co pilot as it s been asluded to has already made the waypoint change, you have to remember, this is cockpit resource management, the captain would also normally would have verified the waypoint change coordinates.