Delta Air Lines is pleased to announce the expansion of biometric facial recognition technology to more airports in the United States. In partnership with the U.S. Customs and Border Protection (CBP), the biometric boarding technology will be expanded to 49 new gates and all international Delta and Delta partner flights originating out of Hartsfield-Jackson Atlanta International Airport's Concourse E, Minneapolis−Saint Paul International Airport and Salt Lake City International Airport over the next month.

Delta understands not all passengers are comfortable with this advanced method of boarding, and that is why facial recognition boarding remains optional.

Delta customers who are traveling nonstop to an international destination can now opt to use biometric facial recognition technogy when boarding their flights at Hartsfield-Jackson Atlanta International Airport's Concourse E, Minneapolis−Saint Paul International Airport and Salt Lake City International Airport.

For those who prefer to board the traditional way, all they have to do is inform the gate agent and then board using their passport and boarding pass just like they always have.

Although biometric boarding offers a seamless, time-saving procedure, Delta is not forcing its passengers to participate if they do not wish to. According to Delta, an encouraging 72% of its customers prefer facial recognition to standard boarding at Hartsfield-Jackson Atlanta International Airport's Concourse F, the first curb-to-gate biometric terminal in the country that debuted last year.

Denise Bay is a staff writer at GET.com. Email: denise.bay@get.com.