"Don't complain; if you're truly innocent then you have nothing to worry about, right?"

Some of this sounds like scaremongering, but hey, all you have to do is remember to not take pictures in an airport, or walk funny, or grumble openly about the lost baggage, or look out the window at the planes for too long, because some air marshal may then be writing you up so that he gets his bonus.

( Marshals: Innocent People Placed On 'Watch List' To Meet Quota )

And don't forget, try not to look paranoid or scared, either! But don't look too confident on that plane! Or ambivalent; it's always the ambivalent ones!