Flights along the U.S. East Coast have resumed normal operation after Federal Aviation Administration announced that it has fixed an automation glitch at an air traffic center in Leesburg, Va., which caused hundreds of delayed and cancelled flights.

An order to hold planes on the ground while the problem was worked on has been lifted, TWC News reported.

Delays started at about 9:45 a.m. on Saturday, in which flights bound for airports in Washington area were most affected, including Washington's Reagan National Airport and Dulles International, as well as Baltimore-Washington International Thurgood Marshall Airport and Charlotte-Douglas International Airport in North Carolina, according to the Associated Press.

At Reagan National alone, delays averaged about three hours, with 50 percent of inbound flights and 42 percent of outbound flights cancelled. In Baltimore, it was an average of one hour, with 58 percent of inbound flights and 36 percent of outbound flights cancelled.

The FAA said that it was working with carriers to resume normal service and that the problem "has nothing to do with an accident or hacking," according to Yahoo! News.

"The FAA is continuing its root cause analysis to determine what caused the problem and is working closely with the airlines to minimize impacts to travelers," the FAA said.