While we appreciate the concern for tight security at airport screening stations at every airport, London's Heathrow Airport has a particularly thorough procedure. Along with lengthy times to transfer between any of its 4 passenger terminals (terminals 2-5), passing through LHR to transfer to another flight can be a particularly stressful exercise in making a connection on time. For instance, on a recent trip from Glasgow to LHR to Dallas, we had a 2 1/2 hour layover. We needed almost every minute on that layover in London to make that connection. In this blog post, I give tips on what to consider, and how to deal with transferring through London's Heathrow airport.