This year a record number of people are expected to travel for holiday season — 28.5 million people to fly on U.S. airlines for Thanksgiving alone.

Those who have family coming to the United States and those traveling internationally for the holidays should prepare for longer airport wait times following the implementation of new security screening procedures for all inbound flights.

In late October, major airlines alerted passengers on inbound U.S. flights to arrive at airports earlier to comply with new directives including short interviews at the gate, additional forms and restrictions on certain types of baggage and check-in services.

The new measures are part of a Department of Homeland Security initiate launched in June that led to the end of the ban on carry-on laptops and tablets on U.S.-bound flights from 10 airports.

The measures affect some 2,100 flights per day from around the world and apply to all passengers flying into the United States from an international airport. The first phase of the DHS initiative was completed in July when airlines were required to expand explosive trace testing.

Business travelers may be especially impacted by the new measures, as they tend to arrive at airports much closer to takeoff than leisure travelers. United Airlines and Delta Air Lines tell travelers flying into the United States to arrive at least three hours before their flight and allow extra time to get through security, and Hong Kong-based Cathay Pacific suspended self-drop baggage and city check-in services for passengers on flights to the United States and implemented short security interviews.

Airlines vary in approach to the new required security measures, so if you’re unsure what to expect call your airline prior to heading to the airport.