Delta and AirTran are heavily affected as is the Hartsfield-Jackson Atlanta International Airport.

The Federal Aviation Administration said the problem, which lasted about five hours, was fixed around 10 a.m., but it was unclear how long flights would continue to be affected.

Doug Church, a spokesman for the National Air Traffic Controllers Union, said controllers were still entering flight plans manually in some locations.

Entering flight plans manually? Will our confidence level go up or down?