[frossie]

Or CDG or ATH or many other (if not most) European airports.

Screening at the gates makes a lot of sense in terms of traffic flow, as you don't get huge queues, and airline personnel hold the plane if there are security hold-ups. Also if there is a breach, you only have to shut down a few gates rather than the whole airport.

The problem is that this will br very difficult to retrofit in many existing US airports because they weren't designed with that in mind.