The SeaTac Airport International Arrivals Facility is the most complex capital development project in the history of the 69-year-old Seattle airport. The project included constructing a three-story building, an elevated sterile corridor, and the world’s longest pedestrian walkway over an active airport taxi lane. Clark Construction was responsible for the design and construction but faced several challenges, including remotely assembling a 3-million-pound, 320-foot-long center-span pedestrian bridge and then transporting it to the project location.TBy leveraging BIM and reality modeling technology with Bentley’s SYNCHRO 4D, Clark Construction linked the model with the construction schedule, developing a digital twin to fully visualize the construction sequencing. They used the application to enable precise planning and execution to safely install and fit the iconic walkway within three-eighths of an inch without causing airport disruptions. The digital twin will be used by the Port of Seattle for facilities management purposes.