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Sky. in a more or less vertical attitude. what happens is we have radar data that shows that the aircraft was found approximately 66 miles from its last known position. now, most airliners have a glide ratio of about 15-1. simply what it means from about 33,000 feet they can glide about 93 miles. so where the aircraft was found from the last known position suggests the glide. however, the radar data suggests a very low ground speed which suggests an arrow die dammic. it's going to be important they find the black boxes. ? >> from what we understand the java sea not too deep relatively 100 150 ...

Okay. understandable that a lot of people are saying wow, i can't believe this happened again, but there are some very important differences here to keep in mind right, walk us through them. >> well i think one of the most important differences is we do have an idea where the plane was because we at least we believe that we have accurate radar data as to where the plane was when the plane may have gotten in trouble. when the radar information ceased when the last radio communication os cured, et cetera and presumably this time around all of the nations, indonesia and others are cooperating ful...

Quote, is on the bottom of the sea. let me go to cnn aviation analysts let me read you a little bit more that we have from the head of this search and rescue agency quote, this is the translation, quote, the coordination that was given to us and the evolution from the calculation point is in the middle of the sea, our early conjecture is that the plane is on the bottom of the sea. this is about 25 26 hours after it disappeared from radar. how could they know that this soon? >> they, it seems to me that they must have additional radar data other surveillance data in terms of information provide...

Just about 40 minutes after this plane took off. what that last signal was specifically and what it tells us? >> right. and there's a little bit of a, a little bit of a mystery about some of the signals. now the initial information said that first the radar data went down which is really nothing more than coordinates. the radar shows you where you are and it is primary radar, it's literally just a blip on the screen and if you have a secondary, then you have altitude and other information. and then the next thing was the radio communication ceased and then finally it was what's called the adsb...

Before it stalls. so you do run into that situation. but as long as you're not experiencing a lot of airplane upset in the form of turbulence you're still in an okay situation as long as you're monitoring the power for the airplane and how the systems are operating. >> you raise an interesting point, because i was talking to a friend and colleague who is an aviation expert in australia, and he made that point. said he'd been looking at the radar information that was available and said they were at 36,300 feet and climbing, doing 353 knots and that there were some in the industry who said that ...