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Don't have right now is a readout of cockpit voice recorder. the flight data recorder as the "wall street journal" said will show what the pilots did, the cockpit voice recorder will indicate why they did what they did. >> or what they talked about while they were doing it, right? >> and also whether someone from the cabin, from the cabin broke into the cockpit. >> so there is still that possibility, the "wall street journal" points this out, it's not impossible at this point that another person came in. that wouldn't be on the flight data recorder if there was some kind of intrusion? >> it wo...

>> and we know that european airliners that allow one pilot in the cockpit are already starting to change that process. you know, we have the voice recorder, which has revealed what the investigator has already said, what doomed this plane, believing the co-pilot did that. is there any other data, miles, that could be coming in if they find the flight data recorders or anything else that could help us get more information about the why and the how? >> you know, a couple things. first of all, the flight data recorder will be helpful because it will just corroborate, underscore what investigator...

Leah: and in this particular aircraft, it had fly-by require which we've talked about that, essentially, you put controls in, a computer decides what to do with those control inputs, and it could potentially fight the pilot. the computer system might actually say no, i'm not going to let this plane climb any higher because it's already going outside its operating end slope. >> i think that's a great point and that's one of the fundamental differences between a boeing and an air bus aircraft is that aircraft on the airbus side wants to have the health of its aircraft it doesn't want to depart c...

Decree -- the aircraft, the floating debris they know the winds and currents, that'll lead us back, hopefully, to the submerges debris, the pingers which will take us to the two black boxes is what we really need to solve this accident. yes, the transponder data is very handy, but what we really need is what went on in the cockpit and what control inputs were being made. trace: we were just talking early, doctor, about the fact that planes just don't sum my fall -- simply fall out of the sky, and we've had two this year. explain to our audience with your experience, it's never just one thing, ...