Washington Air Route Traffic Control Center
Washington Air Route Traffic Control Center (ZDC) is an Area Control Center operated by the Federal Aviation Administration and located at Lawson Rd SE, Leesburg, Virginia, United States. The primary responsibility of ZDC is the separation of airplane flights and the expedited sequencing of arrivals and departures along STARs (Standard Terminal Arrival Routes) and SIDs (Standard Instrument Departures) for the Washington-Baltimore Metropolitan Area, the New York Metropolitan Area, and Philadelphia among many other areas.
Washington Center is the fourth busiest ARTCC in the United States. In 2024, Washington Center handled 2,468,399 aircraft operations. The Washington ARTCC covers 165,000 square miles (430,000 km2) of airspace that includes airports in Maryland, Pennsylvania, West Virginia, Delaware, New Jersey, Virginia, and North Carolina.