the airfield. straight runways with a few aids to help the aircraft come down. anyone trying to walk across the airfield should be an easy target. that would really kind of be the second layer of defense. in may experience you have the caravan which have a controller in it and the purpose of that person is as the aircraft lines up on the threshold to get airborne, that's the final check. >> so then you're talking about the eyeballs. all of the people who could walk around the plane do, walk around the plane, that could have maybe should have seen something. you've got airport security, you've t got grounds crews, and you have the pile t lots. the pilots always doing a walk around. what the s. the responsibility? >> this for me is like the big key bit, the third layer of defense. you've got the baggage handlers, the catering staff, the little guy that driving the tow tug that pushes you out. that's looking at the whole