Spiff, I absolutely agree with you. Unfortunately, our government seems to be unable to implement such a system whether due to expenses, brain power, or a combination of the two. As such, we are left with them hanging their hat on the idea of unpredictability in the system. My point, however, is that if this is the best they can do, don't do it at the expense of the one TSA lane in the few airports that have Pre for DL pax where people are generally more efficient than the average 1-2 trips per year traveler who holds up everyone else!