Hartsfield-Jackson Atlanta International Airport is designed for easy navigation, and Concourse B is no exception. What Airlines fly out of Concourse B in Atlanta? The concourse features 35 gates (B1-B36) and is connected to other concourses via the airport’s Plane Train, a convenient underground rail system that runs continuously between terminals. Whether you're arriving, departing, or connecting, the Plane Train makes it easy to move between Concourse B and other parts of the airport quickly.For passengers making a connection or arriving from a different terminal, clear signage and frequent Plane Train departures ensure that moving through the airport is hassle-free.