by cnn's law enforcement analyst and others. >> david, some theorists say the co-pilot could be to blame because he was too inexperienced to make that sharp westward turn. could you argue the 9/11 hijackers were way inexperienced, too, and they managed to hit their targets, sadly? >> i think that's going into speculation again. there's a lot of danger in doing that. in my history with investigations is when you start starting to try to find conclusions, all the fact comes along and try to support that. so it really can lead you in the wrong direction. i've tried to stay away from speculating about why or who. but rather the what. >> rather the what. go ahead. >> the person sitting in the right seat can fly the aircraft completely competently. that's why they're there. that's why you have two pilots. any indication that the co-pilot might not have the skill to fly