A traveler undergoes an enhanced pat-down by a Transportation Security Administration agent at the Denver International Airport. (John Moore/Getty Images)

The Transportation Security Administration announced Friday it has expanded a program that allow travelers to move through airport security without having to remove their shoes and jackets and allow them to leave their laptops in their cases.

Starting later this year, TSA will allow U.S. citizens to apply for the program online. Applicants must still visit an enrollment site to provide identification and fingerprints. As part of this new expansion, TSA will start the program at two initial enrollment sites — Washington Dulles International  and Indianapolis International airports. Eventually other enrollment sites will be added.

TSA officials said the program has received high marks from participants after its launch in 2011.

As part of the program, participants will undergo a background check, submit fingerprints and pay an enrollment fee (expected to be $85 for five years). Once approved, they will receive what is known as a Known Traveler Number, which will allow them to move through designated security checkpoints at participating airports.

The TSA Pre-Check program had previously only been open to travelers who applied through an airline’s frequent flier program or who were enrolled in other so-called “trusted traveler” programs, such as Global Entry, which is sponsored by Customs and Border Protection.

Currently, more than 12 million travelers are part of the TSA Pre-check programs. The expedited screening lanes are now available at 40 airports across the country, including Dulles International, Reagan National and Baltimore-Washington International Thurgood Marshall airports.