Crews, right, the pilot and first officer, very often they've never met before or very few times. >> this guy hasn't flown that much. >> this captain may not have flown much with this first officer and may not know what's going on in his personal life. that can work for you and against you because if you really don't know each other you don't worry about speaking up when the guy next to you is acting a little silly, noernd on the other hand, you don't know his personal history. >> are there periodic exams, psychologically -- >> at the very very beginning, yes, of when you're hired as a pilot. ...