The Transportation Security Administration announced that its PreCheck trusted traveler expedited screening program is now available at another major airport.

The latest addition to PreCheck is Portland International Airport, where the expedited screening is open to participating members of the Alaska Airlines, Delta and American frequent flyer programs, TSA said.

A few weeks ago, TSA opened up a PreCheck screening lane at Seattle’s airport -- the first one in the nation for Alaska Airlines frequent flyers. “United Airlines, Jet Blue and US Airways and additional airport locations will begin operations later this year,” TSA said.

TSA’s PreCheck is currently available for participating American Airlines AAdvantage members at Chicago O’Hare, DFW, Miami, Las Vegas, New York (JFK), Minneapolis and Los Angeles; and for Delta SkyMiles members at Atlanta, Detroit, Las Vegas, New York (LGA), Los Angeles, Salt Lake City, Minneapolis, Washington D.C. and Orlando.

More than a million passengers have gone through the faster security process since its inception last fall.

In addition to accepting U.S. citizens who are participating members of frequent flyer programs, PreCheck is also open to members of Customs and Border Protection’s (CBP) trusted traveler programs, including Global Entry, SENTRI and NEXUS. Individuals interested in participating can apply by visiting www.globalentry.gov.

Participants are eligible to be selected for an expedited security screening procedure that means they might not have to remove their shoes, belts or jackets; and that they might not have to take liquids and laptops out of their carry-on bags. Eligible participants are identified to security personnel by a designator in their boarding pass bar code.

For details on the PreCheck program, go to http://www.tsa.gov/what_we_do/escreening.shtm.