Listening to MSNBC a bit ago, they said that one of the problems with the air marshal system is that they are easy to detect. This is because, apparently, the air marshals flash their credentials and get on the plane first.
I think if W spends a few hours thinking reeeeeeallllly hard on this problem, he might be able to come up with a solution to this.
(Like, board 'em with the rest of us poor schmoes.)