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Radar coverage and very limited satellite coverage because that is not a volatile area so there isn't going to be a lot of surveillance, if you will, of that particular area. >> mark halpern? >> focus on the last couple of days on some of the communication systems that were shut down. how much expertise would be required to do that? could someone learn how to do that on the internet or is that going to be only done by a pilot, co-pilot, or someone with real training? >> shutting down -- >> if somebody was interested -- >> the transpoppnder. >> colonel mcsally first and then greg. >> you could ...

How extensive their satellite coverage is. how much do those tensions pull apart that coalition and hamper the investigation, do you think? >> you know, you hit the nail on the head. a country like india is not going to want to give up its radar screens, show the resolution, the real-time capture of images. they don't want to do it. what they'll say is we'll take a look and we'll tell what you we find. if we do, we'll give you something. that's not good enough. look at the malaysians. that plane flew right over a radar site and it took them how many days to come around and tell everybody? no w...

People say they suspect it went south rather than north would be the lack of satellite coverage. but stand by, we're going to bring you back in the next segment. i want to bring in nbc's kerry sanders with the latest on the search. what can you tell us investigat investigators are looking at now? >> they've expanded the area of search. up until this point, we'll look at the map i'll bring it up on the telestrator, this is the area they've been looking at, they followed the plane's path and they felt it looks like it went this way here so as they're following the plane's path they've decided in...

Carriage. >> you think it's possible somebody could jack this jet, fly it for hours and get it to lang strip for use later? >> i don't think you can dismiss it at this point. seems far. fetched but seems far fetched the aircraft could have disintegrated in mid-air and that all the satellite coverage of the earth that we have these days, some flash of light, some system isn't going to pick that up. that seems almost equally as fantastic to me. >> tom blank, live with us. thank you so much. >> nice to see you. >> consider this. we'll get into this with lea gabrielle. consider this. it is widely ...

A hijackuation would have taken it off. >> sabstage what do you mean? >> hijacked by someone coming in the cockpit. and sabtame by the crow taking over the cockpit and not cubing the journey in which they were told to conduct. it was someone some the crew whether blackmailer seek logical problem. something along those lines. >> if it was sabstage. are thereuaries of the globe that are blackout regions and radar doesn't work and the plane would be invisible? >> yes, as it sounds with technology, there are areas in the world, long wave and long-distance radar can't cover all of the radar signatu...