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On a recent trip to the Bay Area, I was amazed at how much better the San Jose screening area ran with just a few differences from the norm.
They had one enormous queue, with just a few screening stations that ran _fast_. I think the lines ran fast in large part because they had people working full-time to remove buckets from the X-ray belt and get them out of the way. And they had -- get this, it's crazy! -- they had BENCHES right next to the belts.
I'm pretty sure that at airports where this does not happen, they have a guy at every other screening station whose job it is to laugh at the poor schmucks sliding around on the waxed floor trying to get their shoes on.