believe it. this is data that came from the acars system that adjusts the sequence of events investigators have been laying out. telli tell us about it. >> that's correct. acars can be set up different ways. it can radio back to the ground the current flight. if you set it up differently, it will radio back to the ground the next leg or leg after that is going to be. at some point it radioed back or satellited back this change in course, this very sharp left turn. there are a lot of ways to change the direction of the airplane. you can grab the yolk, turn it, reach up to the glare shield where there's a heading mode. you can twist the dial. the smooth easy way to do it is enter it into the computer to head for another waypoint, another three dimensional point in space. that was done in this case. it's standard, unhurried.