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Satellites overhead and potential radars and sensors in the region and do not see any evidence of a mid-air explosion. no intelligence data showing the mid-air explosion. that may not be definitive that did not take place. let's explain that the satellites that supply overhead is the launch of a ballistic missile. a threat. that would be a very hot steep trajectory of a missile coming off of a coastal region. this happened perhaps over open water and perhaps whatever the event was was not hot enough or long enough to provide the kind of infrared image signature in a satellite and intelligence ...

Malaysian police are questioning the man who hosted these two iranian nationals in kuala lumpur. the national who is had the stolen passports who boarded the jet. we have more on that angle as we learn that. the report that the last words heard from the crew of the plane were "all right, good night." . after searching the intended path of the flight, malaysia's military said they may have radically changed course, popping up as a blip on radar more than an hour later. hundreds of miles away. a dramatic change in course over the straights and also that means a search area has suddenly doubled i...

And with all these conflicting reports and malaysian airlines backing off for another report, how are families handling this? >> you can only imagine just how difficult it must be for the families. we are going into the 6th day. just turned day six in the hunt. several hour away from daylight and still we don't have anything concrete. what i can say about the search is it's something we got yesterday and the fact that this is a path, a flight path that has been inflicted that shows a plane, an unidentified plane flying back over malaysia into the streets. why this is linked to malaysian airlin...

Massachusetts. in part because the malaysians can't agree where the evidence shows the plane was last spotted. the military said it may have changed course, popping up as a blip on the radar and hundreds of miles away. now bill palmer and author of understanding air france 447. bill, welcome. >> thanks, brooke. >> we keep hearing these experts talk about the missings flight and the fact that the transponder went from on to off. first for all of us, what does the transponder do? >> a transponder sends information down to the radar air traffic control. it was referred to as secondary radar. it i...

Said that's par for the course. after spending five and now on to the 6th day searching the area. malaysia's military now said it may have to radically change the course and popping up as you watch the trajectory. popping up as a blip of the radar. a dramatic change of course. malaysian authorities overwhelmed by the piece of information. they realized their radar information and tremendous confusion about the plane's final path, adding to the grief for the families of the 239 people who are on board that flight. let's go to washington, d.c. for the colleague here. tom forman.