An "equipment outage" at Atlanta's William B. Hartsfield International Airport has forced a "ground stop" there, the Federal Aviation Administration says.
There's also a "ground stop," at Houston's George Bush Intercontinental.
The problems, as often happens with the airline system, are rippling across the nation.
According to the Atlanta Journal-Constitution, "a computer glitch shut down most, if not all, departing flights at Hartsfield-Jackson International Airport and other airports across the country Thursday morning."
The Associated Press has sent out this "alert":
AirTran official: Widespread delays, cancellations nationwide due to FAA flight plan computer problem.
11Alive.com in Atlanta has this:
"We are having a problem processing flight plan information," FAA spokeswoman Kathleen Bergen said. "We are investigating the cause of the problem."
Update at 10:40 a.m. ET: The FAA says the computer glitch has been fixed. Quite a few airports on the East Coast, though, are still experiencing significant delays.
Update at 9:30 a.m. ET: More red, orange and yellow dots are starting to appear on the FAA's map that shows where flight delays are occurring (red indicates delays of more than 45 minutes; yellow reflects delays of 16 to 45 minutes; orange indicates incoming traffic is being delayed).
— Atlanta is red.
— Washington (Dulles) is red.
— Washington (Reagan National) is yellow.
— Philadelphia is yellow.
— Newark is red.
— New York (LaGuardia) is orange.
— Chicago (O'Hare) is yellow.
Update at 9:25 a.m. ET. Jim Burress of NPR's WABE in Atlanta says airlines are manually filing flight plans:
'Computer Glitch' Delays Flights Across The Nation