Starting Wednesday, select American Airlines frequent fliers at Logan International Airport will no longer have to remove their shoes and coats and take their laptops and liquids out of their carry-on, as the Transportation Security Administration expands its PreCheck program in Boston.

The free program, which started last fall and kicked off at Logan in June with Delta Air Lines travelers, has attracted more than 2.5 million passengers at 24 airports across the country. At Logan, only Delta and American have been asked to join the program. Nationally, it’s five airlines: Delta, American, Alaska Airlines, United Airlines, and US Airways .

Members of the US Customs and Border Protection Trusted Traveler programs are also eligible.

The TSA examines each applicant’s travel history before granting them clearance. But PreCheck does not necessarily guarantee a quicker trip through security. To keep the process random, travelers won’t know until they get to the checkpoint if their boarding pass has been embedded with a code that allows them to through the expedited lane.