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The Potomac TRACON in Warrenton provides air traffic control services to the Baltimore-Washington and the Richmond-Charlottesville areas. The TRACON controls the airspace over Andrews, BWI, Ronald Reagan, Dulles, Richmond and many other airports.

Ground stops were also issued at Richmond International Airport, Charlottesville Albemarle Airport and Manassas Regional Airport, adding to the growing list of delays affecting travelers.

Passengers at Washington Reagan National Airport were huddled at gates Friday evening as they awaited their flights, with several sprawled out on the floor. While the ground stop has since been lifted, delays at Baltimore have reached over two and a half hours, three hours at Dulles and more than three and a half hours at Reagan, according to the FAA, as the airports work to recover from the stop, which lasted about three hours.

Flight cancellations have begun to tick upward and will likely increase throughout the evening as flight crews reach working hour limitations.