ORLANDO, Fla. -- Florida's busiest airport is becoming the first in the nation to require a face scan of passengers on all arriving and departing international flights, including U.S. citizens, according to officials there. The expected announcement Thursday at Orlando International Airport alarms some privacy advocates who say there are no formal rules in place for handling data gleaned from the scans, nor formal guidelines on what should happen if a passenger is wrongly prevented from boarding.

Airports in Atlanta, Boston, Chicago, Houston, Las Vegas, Miami, New York and Washington already use face scans for some departing international flights, but they don't involve all international travelers at the airports like the program's expansion in Orlando would. The image from the face scan is compared to a Department of Homeland Security biometric database that has images of people who should be on the flight, in order to verify the traveler's identity. 

U.S. citizens at these airports can opt out, but the agency "doesn't seem to be doing an adequate job letting Americans know they can opt out," said Harrison Rudolph, an associate at the Center on Privacy & Technology at the Georgetown University Law Center.

U.S. citizens at the Orlando airport -- which had about 6 million international passengers in the past year -- will be able to opt out just like at the other airports if they don't want to provide their photograph, Jennifer Gabris, a spokeswoman for the U.S. Customs and Border Protection said in an email. However, a notice about a possible rule change for the program states that "U.S. citizens may be required to provide photographs upon entering or departing the United States." 

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