The Dublin Airport website even has a handy guide, telling you to follow the signs for 'flight connections' and not baggage reclaim. Generally speaking, the lines for transit security are much shorter than for actual customs. This is similar to the security check you'd receive before your departing flight (empty your water bottle and put your laptop and phone through the x-ray machine), and when you complete this check you'll exit into the gate area with all the other departing passengers. In almost all cases, if your bags are checked through to your final destination and you already have your onward boarding pass, you'll go through transit security when you land at your connecting airport instead of customs. While the exact answer to this question depends on the country you're traveling to and through, there are a few patterns to be aware of.

This is a great question for Janel to be asking, because having to clear customs in Dublin would make her 75-minute layover rather rushed. Will we go through customs in Dublin or Rome? We fly from Chicago, stop in Dublin for an hour and 15 minutes, and then on to Rome. I'm going on a cruise out of Rome in May. TPG reader Janel wants to know where she'll clear customs on an international itinerary with a connection on the way. One of the most important things to do before leaving on an international itinerary is to make sure your passport/visa/immigration documents are all in order, or you could end up ruining your trip before it starts. 'Reader Questions' are answered twice a week by TPG Senior Points & Miles Contributor Ethan Steinberg.

Flight arrival from rome to jfk