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Another theory is shadowing another airliner. turn off your transponder and get near that airliner so any radar blip you come up as is interpreted as being a regular commercial airliner. it's sort of hiding in the wide-open. the question is, could that really be done? it makes an interesting theory. we are trying to figure out if we can simulate that one to just try it. another idea, just turn your transponder off. flying on the regular commercial highways in the sky, you might not be picked up as being a threat. military would say it has to be a commercial airline he at that altitude in that ...

Was it sabotage, was it some kind of hijacking? we do not know the answer to that. nobody at the moment really knows the answer to that. because they have no definitive intelligence or information that leads them to believe it was an act of terrorism, sabotage, a deliberate act, pilot suicide, any of the theories we've all heard for the last several days. what they do have is data, information now, technical, highly technical data that tells them the likely path of the plane. in other words where it is not why and how it exactly got there. there is also a very key radar blip if you will from t...

Takes time. i guess i would say we all need to be patient. as impatient as we are, and certainly the families are, to have news of their loved ones. it's going to take a long time to work our way through this. >> i think those of us who are outsiders to this technology, who are just sort of consumers of air travel, don't know the ins and outs of it. we think of radar as omniscient. we think of radar as something that covers every corner of the globe, that's why it's so hard to imagine a 777 airliner disappearing. we assume they're being tracked all the time. does it make sense to you that ther...

Indication if the pilot suddenly decides to go on some sort of a suicide mission? >> youfd think so. that's happen in the united states and the rest of the world. the way they track the planes, if you turn off the transponder you still have a primary radar blip. they can detect it's something out there. it doesn't say this is a united aircraft or american or whatever. this would basically go off track. they don't have quite the air traffic control we do out in that area. they're probably in the process of switching controllers, switching between different countries and air defense intercept zo...

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...