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Out of the acars system in a completely different kind of thing. i don't know why they call a ping as a matter of fact. >> let me go to henry hughes, retired ntsb senior accident investigator. you deal in facts, henry hughes. there are pressing few facts that even the few scraps of facts we've been given through the week have been completely contradicted the very next day in most cases. what is your take on where this investigation is right now? >> i think the folks from malaysia are a little bit new at this. fortunately they haven't had many major accidents. as a result, i don't know that the...

Pings. >> well, words include more than they leave out. and words never say all there is to say about everything. the word "ping" started out in sonar. ping ping in a submarine. but there's an expression now, i'll ping you, means i'll send you an e-mail and remind you to do this. so there's two different kinds here. talking about the underwater clicking like a bell that would be a ping from my day. it's also being used in this context to refer to a radar blip which has an echo or just a signal being sent to satellites. so maybe it's being used three ways. but the pings that the pilot was talki...

You've heard? >> well, to talk about prohib probability of likelihood, let's assume that the pings, and i'm referring to the ping as like an internet protocol ping when you are verifying an ip address you send a ping out to see if you have a response. that's what i'm referring to when i say ping from the acars system. because it has to communicate, send that ping out and get the reinformation back. so let's assume there really were pings coming from that location. now assuming that, i find it extremely difficult to think that somehow the system failed, that 777 is the most reliable aircraft in...

Is "wall street journal" reporter john stroud. thank you for joining me. you just heard barbara starr's report there. clearly what seems to now be indisputable is the fact that these pings were heard suggesting the plane carried on flying for four to five hours after we had been led to believe in the first few days. what is now conjecture or what the u.s. authorities believe is that it landed in the indian ocean. but you have a different theory. tell me what that is. >> well, we were reporting just moments ago the malaysian airlines boeing 777 missing since late last friday actually continued ...

Manufacturers, everybody to do with that aircraft they're obligated by annex 13 not to report to the public but to the civil authority in charge of that accident. they cannot release their names, any information we have now is probably being ill-gotten. because of the fact it's not really -- they can't report that information. >> let me ask you, david souci. you're very experienced in this field. but nobody however experienced can really fathom what has gone on here. what do you think is the most likely of all the theories you've heard? >> well, to talk about probability of likelihood, let's a...