This is what I found on CNN.com:

What if you could simply look at a screen for 2 seconds and check in for your flight?
Imagine glancing at a screen for another 2 seconds to drop off your bags at a luggage station? How easy would it be to merely look at another screen to breeze through ID checks at TSA security checkpoints or the departure gate?
All this, without having to use your passport.
Well, now you can.
Atlanta’s Hartsfield Jackson International Airport and Delta Air Lines have opened the nation’s first curb-to-gate biometric terminal, which promises to improve aviation security while moving travelers faster through screening.
“Atlanta airport — the busiest airport in the world, our largest hub — is the first airport in the US to roll this out,” Delta Chief Operating Officer Gil West told CNN at the terminal’s opening on November 29. “It saves nine minutes on the ground for the boarding process which is time that our customers won’t be spending in lines waiting to board the aircraft.”
The biometric ID technology being used here is facial recognition. It’s a camera-based system that compares scans of travelers’ faces to a database of verified ID photos curated by US Customs and Border Protection (CBP).

Information provided by CNN.com.

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