of all the major airlines, certain checks and balances to monitor and help and assist each other in the flying of the airplane. the pilot flying has certain responsibilities. the pilot monitoring has certain responsibilities. and we have certain protocols that we follow. at a certain point prior to landing at a certain altitude, a certain distance from the runway, we must be stabilized with the wings level at the proper descent rate, the proper speed, the proper altitude all the way from that point to the runway. if we're not, we're required to go around. so we need to find out why they didn't. >> sully, speaking of that, we have some cnn exclusive video of the moment the plane makes impact. when you talk about being in exactly the right position, the wings level, and certainly in this case the nose, can you react to this as you see what's happening? >> it's very difficult to tell. i think it certainly looks abnormal. it looks as though the airplane is at a very high angle of attack.