officials to pick up on without a significant amount of time with the patient. there may have been clues, but they may have been hard to notice. >> let me ask you the same question david, in a different way, because when you fly in a plane, which you have you spend hours and hours with someone in a tiny space. you only have each other to talk to. is it possible that someone would have noticed that something was airywryawry with this man? >> well, he clearly loved flying. that's what he did. when you're in the cockpit environment, it's as if everything else goes away. it's really not indicative of what's going on inside the head. there's a whole different tier and level of the operational part of the brain and what we're trying to do to accomplish that flight complete it successfully and this type of event. i really can't see that there's some kind of outward appearance that would say, hey, i'm about ready to have a mental breakdown. so the work has to be done before that gets into the cockpit. certainly it's important to have the relationship which we do. but i think there needs to be more. it's just not enough.