The Transportation Safety Administration is expanding a new program to make airport security check-in faster at 28 of the nation's major airports.

The program, dubbed "Pre-Check," lets travelers who get TSA clearance avoid the hassle of removing their shoes, belts and jackets before boarding.

Passengers in the program must be U.S. citizens and undergo fingerprinting and a background check.

"It's part of a fundamental shift in how we approach aviation security," Secretary of Homeland Secretary Janet Napolitano. "Not all travelers are alike and they don't all present the same risk."

So far, five airlines are signed up to use the program by the end of the year.