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Here's an article about it if you don't to watch the video:

http://www.syracuse.com/news/index.ssf/2013/11/syracuse_airp...

It sounds like it's an electronic one-way gate to exit the secure area of the airport, replacing the TSA agent who used to sit at the exit. Physical one-way turnstiles have been around for a while - I'm not sure I've ever seen one at an airport.

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I would assume that getting a cartful of bags through the turnstiles is kind of difficult, and that's the reason that strategy has been avoided.

EDIT: Grammar.

Since it would presumably be located before baggage-claim people are unlikely to have a "cartful of bags" at this point - they would only have what they're capable of carrying on the plane.

Given the massive suitcases I've seen some people try to gate-check, I'm not sure that's such a great idea.

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