UPDATE: The Federal Aviation Administration says an "automation problem" that snarled air traffic throughout a large swatch of the Northeast stretching from New York down to the Carolinas has been resolved.
The agency said that a computer system at an air traffic center in Leesburg, Va., that controllers use to direct high-altitude flights was back in service, and that officials were expected to have lifted any remaining order to hold planes on the ground by about 4 p.m. EDT.
The FAA said it is continuing to investigate the root cause of the problem, and was working closely with the airlines to minimize impacts to travelers.
Information posted online by the FAA indicated that the problem concerned the En Route Automation Modernization computer system, also known as ERAM.
Flights are being delayed in the Washington region due to technical issues at a Federal Aviation Administration center in Washington.
Baltimore-Washington International Thurgood Marshall Airport says a computer outage is limiting flight arrivals and departures there as well as Washington's Reagan National Airport and Dulles International Airport.
An FAA spokeswoman says the agency will be issuing a statement soon. But she did not immediately comment on the problem.
American Airlines said in a tweet that air traffic control issues are impacting all East Coast flights. The airline is urging passengers to plan accordingly.
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