saying is that the transponder was turned off so the normal air traffic control radar wasn't working. but military radars that are designed to see targets that are trying to hide, you can see because of the reflection of the radar off of the metal skin. it would be interesting to see what the altitude of the airplane was, was it descending or whatever. and i would be looking at the data right when they lost contact with it. so did they lose contact over that island because it was just too low and it was hard to seat target or too far away from the radar? or was the airplane coming down at that point? >> john hansman appreciate you being on. we'll continue to consult with you in the days ahead. still ahead on the the agon the families of those on flight 370. we will tell you more about the people on board later on in the program tonight. also in the oscar pistorius trial, the defense score some