The U.S. Transportation Security Administration (TSA) has implemented temporary enhanced security procedures in the wake of a botched terror attack Christmas Day aboard a Delta Air Lines (operating as Northwest Airlines) flight from Amsterdam to Detroit. If you are flying to the U.S. anytime soon, bring some extra time and a large dose of patience.

The TSA has implemented additional security measures through 30 December (and possibly longer) that will affect your flights to the United States. According to the TSA the security measures will apply to the last point of departure for 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 will 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.

There have been reports, particularly regarding short haul flights between Canada and the U.S., where security line waits have caused the cancellation of a number of flights. Some airlines have consolidated multiple flights into fewer, using larger aircraft. Each airline is responding differently. We advise you to call your airline ahead of your departure, the day of your departure and keep track of your flight status. Give yourself, at minimum, an extra hour for check-in and the multiple security screenings you are likely to encounter. In fact, try and give yourself even more time. If you are making connections to the U.S. from another country or are connecting within the U.S. after your international flight, make sure you have sufficient time to make your next flight after security delays and immigration clearances.

The TSA will determine whether continue these measures beyond the 30 December expiry date. Keep in mind that added security measures may be implemented by other government agencies for flights to other destinations, not just the U.S. Always check with your carrier before departure.