inspector, author of "why planes crash." i want to talk about the geography again. that is one of the very few details we have now. eastern ukraine near russia. obviously an area where there is conflict right now. we know in our history sometimes commercial airlines get caught in international conflict. the korean airlines flight shot down by the soviet union comes to mind here. what kind of precautions are in place to keep this from happening? >> well, in that part of the region, in that region there really are not a lot of things to prevent this from happening because they're not interacted like we are here in the united states where the military and the civilian radar are shared, sometimes sitting right next to each other in the control areas. so that's not the way it is over there. so we talk a lot about it in the malaysian airlines about the fact that the transponder went off-line and the transponder identifies the course, which aircraft it is.