stall as we saw in the case of air france 447. but yes, what's really important here is that the size the debris field is really key to come up with an idea as to whether it broke up in flight. one thing which i think we should be asking for and skt authorities for is there's plenty of primary radar coverage in that part of the world and going back to twa 800, they didn't have a lot of evidence from the black boxes because it was so sudden. one of the things that helped them determine what happened. they used primary radar he tle could see big pieces radar returns of the aircraft as it broke up mid air. that could be a useful thing as well. >> you talk about useful information, mary. one thing that i, i'm struck by this is not macabre curiosity about what happened to this plane. what happened to this plane is incredibly important to recreate in a simulator so we know what happened and it doesn't happen again. >> that's right, going through literally piece by piece, step