might be versus ground speed. this is important. the wings don't know anything about the ground. all they know about is air molecules passing over the rig, and that's what gives it lift. that canning very divergent depending on where the wind is coming from was there an updraft, was there a downdraft? there is a number of scenarios that could be at play here which would cause that ground speed to be a little misleading. >> and why those black boxes are so important. peter, really quickly before i let you guys go the bodies that have been found. you expected investigators are looking at the flight manifest to see exactly where people were sitting on the plane? >> sure. with 30 victims recovered, you want to know were they sitting in a certain area of the plane? the flight attendant, was she assigned to the rear of the plane, was she in the front of the plane? that might give investigators an initial feel about where the breakup occurred what part of