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So whoever dropped the plane down to 12,000 feet wasn't trying to evade the radar, but they were well below a heavily traveled air corridor. planes travel on the highways in the sky, they share the air space with lots of other aircraft. 12,000 feet allowed this flight 370 to avoid all that air traffic, but they were still on the radar being tracked until about 2:40 a.m. >> will ripley, the day is just beginning. any word on if officials will comment about the drop in altitude of this plane? >> no official comment. cnn confirmed this through a source with very close knowledge of this investigat...

Flight 370 and the families are holding out hope against hope. thank you, david, appreciate it. more expert opinions on the hunt for malaysia flight 370. ten search planes are in the sky, scouring remote parts of indian ocean for any trace of the missing airliner. the families of the 239 people on board waiting in agony to find out what happened to their loved ones. they have been waiting now for 17 days. i want to bring our panel in now. i want to get to mikey first. how long should the crews keep searching for this plane. that is a question and how long will the countries who are involved,...

You slice this, this piece of information opens up at least a second and maybe a third location where we should begin searching. just for one thing, take that -- 12,000 foot altitude and extrapolate out all the pinpoints we have gotten and see how far that plane would have gotten given the higher fuel burn at the time. i'm also curious about the reports that there was a low flying plane that was seen by a fishing boat off the coast of malaysia. what do we know about that? where exactly does that occur? how many nautical miles did it take to get from 35,000 feet down to 12,000 feet? that would ...

>> will officials make any comment about the drop in altitude? do we know anything about that? >> reporter: nothing official right now on this. this is coming from a source that cnn has spoken to that has close ties to this investigation. but we do know that efforts are focusing more now on this area about 1500 miles southwest of perth, australia, in the south indian ocean. this is where three countries now, australia, china and france say they have satellite images showing possible jetliner debris. we know nasa satellites were in the process of repositioning to get a closer look at this area ...

Radar was -- data was collected over an hour and 20 minutes. we don't know the rate of descent. and also the turn precipitated the descent, according to the depiction we have. in other words, they made the turn first and it seems look a relatively slow turn if it took them two minutes. that said, we want to give you what might have been a scenario in which something like that could happen, and the way i said it to mitchell is that it is a dramatic decompression. the explosive bam, maybe a bulkhead has given away, maybe an explosive device in the back of the aircraft, get us down, get us turnin...