Below, from the Transportation Security Administration
TSA Guidance for Passengers on Heightened Security Measures in Place Following Dec. \
Q: What additional security measures is TSA taking domestically?
A: TSA has a layered approach to security that allows us to surge resources as needed on a daily basis. We have the ability to quickly implement additional screening measures including explosive detection canine teams, law enforcement officers, gate screening, behavior detection and other measures both seen and unseen. Passengers should not expect to see the same thing at every airport.
Q: What additional security measures are being taken for international flights to U.S. destinations?
A: TSA issued a directive for additional security measures to be implemented for last point of departure international flights to the United States. Passengers flying into the United States from abroad can expect to see additional security measures at international airports such as increased gate screening including pat-downs and bag searches. During flight, passengers may be asked to follow flight crew instructions, such as stowing personal items, turning off electronic equipment and remaining seated during certain portions of the flight.
Q: Do passengers need to do anything differently to prepare for checkpoint security procedures? Has anything changed in terms of what passengers can bring in their carry-on or checked bags?
A: At this time, security checkpoint requirements for passengers departing U.S. airports remain the same. Passengers do not need to do anything differently, but they may notice additional security measures at the airport.
Q: Should passengers plan to arrive at airports earlier than normal?
A: Passengers traveling within the United States should give themselves extra time to check in and proceed through the security checkpoint before their flight, especially during the busy holiday travel season. TSA advises that passengers traveling on international flights to U.S. destinations allow extra time for security and arrive an additional hour earlier.
Q. How long will these measures remain in place?
A: TSA will continuously review these measures to ensure the highest levels of security.