At some airports, you face is your ID. But does that put your privacy at risk?

Every day in airports across America, travelers confront facial recognition technology.

It probably saves time. Federal officials say it's making us safer. And for the millions whose mobile phones already recognize faces, this would seem nothing new.

But how does old-fashioned privacy square with all these head shots and database comparisons? Where does the data go? What happens if you say no?

These and other questions arise at Los Angeles International Airport and beyond as government and industry leaders embrace biometric measures _ especially facial recognition _ and many privacy advocates resist. Some travelers' questions are easy to answer. Others, not so much.