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But doesn't seem like. >> i have you done flight simulations? ever tried it? >> no we do not. we don't practice those types of simulations. it's not a practical thing because you get to that point you know how to land an airplane so this is a matter of landing in the an unusual surface area. >> david you and i were talking off camera and i was needing comfort from you given the title of your book and the fact we all fly. there was some notion did this plane just fall out of the sky? and they don't just fall. the way they are designed is -- what was the statistic you were saying? the rate a pla...

Tell him what position the aircraft is. flight 447 in that accident the air speed indicators were not working and he no idea what speed he was. whether he was under speeding or -- designee didn't know. sometimes you're in limbo up in the air. >> that's right. whereas in this case we don't know. your point was good we don't know what happened. people say why your speculating. why are you doing this? it's horrible for families. the reason we speculate is to assist in the finding of the aircraft. where is the aircraft. if it's a power on stall a deep stall like this one it could go in literally a...

>> well, i think there's a couple of reasons. first, they have the voice recorder which records all of the sound and all of the discussions taking place inside the cockpit. so they know what each and every crew member said and did during the approach. secondly, we have no idea yet what the condition of the flying pilots was. he could have been injured, he could be in deep shock. the interview is important, but what's really essential is the voice recorder, and that will tell the tale. jon: we know that the stick shaker, the thing that alerts pilots that they are just about to have a stall, an ...