Connecting from T1 to a flight departing the Concourse, follow the green transfer signs to security on level 2. After screening, proceed via level 3 to the train platform on B1. Concourse-bound trains are listed about every five minutes; the airport warns that you cannot return once you board. At the Concourse, go up to the departure gates on level 3. If you lack an onward boarding pass, ask the airline about the transfer desk after security on level 3.