In 2001, Detroit Metropolitan Wayne County Airport (DTW) opened a new runway parallel to three existing runways. While this increases DTW's runway capacity, the airport is served by an airspace (routes, procedures, and controller assignments) that was designed only for a three-runway airport. To increase the airport's effective capacity, the Detroit-area terminal radar approach control facility (D21 TRACON) and nearby air route traffic control centers (ARTCC) are redesigning their airspace. This paper describes the simulation modeling effort to estimate delay and cost benefits of the ARTCC redesign for arrival traffic. The model, written in the SLX simulation language, represents miles-in-trail (MIT) restrictions, as well as air traffic controllers' ability to direct flights to different paths dynamically, based on predicted demand downstream. The redesign work is part of the Federal Aviation Administration's Midwest airspace capacity enhancement (MACE) project.
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