United States, July 28 -- Turner Construction Company, in partnership with The Metropolitan Washington Airports Authority and PGAL, celebrated the topping out of the Tier-2 Concourse East at Washington Dulles International Airport (IAD), marking the end of vertical construction for the project.The 449,930-square-foot concourse is a transformative addition to IAD's infrastructure, replacing outdated ground-level boarding areas with a modern, 14-gate facility designed to support regional flight operations and improve the passenger experience. The structure is built directly atop the active AeroTrain station, a complex feat requiring uninterrupted operations of the airport's automated people mover system throughout construction. Tier-2 Concour...