Flights resumed Wednesday after computer problems grounded nationwide flights heading into the Southern California airspace, officials said.
The Federal Aviation Administration issued a ground stop about 2:20 p.m. as officials dealt with "unspecified computer issues" at its Los Angeles Center air traffic control facility, the FAA said in a statement.
Travelers at LAX, Bob Hope Airport in Burbank, John Wayne Airport in Orange County, Ontario and Oakland airports reported flights being grounded.
Airports resumed flights by 3:20 p.m.
At least four flights were diverted from LAX to San Francisco International Airport, SFO spokesman Doug Yakel said.
Mineta San José International Airport spokesperson Rosemary Barnes said the ground stop at LAX was "impacting flights at SJC to/from LAX, Burbank, Ontario, Orange County, San Diego, Las Vegas and Phoenix." Two flights were ultimately canceled at SJC.
"Some flights were diverted and the agency issued a nationwide groundstop for flights heading into the airspace managed by the center. The agency is gradually restoring the system," FAA officials said.
NBC LA viewers said planes had to turn around mid-flight.
"My plane was supposed to land @ LAX from Oakland and we had to turnaround!" Janice Ponce Brown said via Facebook.
Another viewer said a flight into John Wayne Airport was "in holding status" and not able to land.
Travelers were urged to contact their airlines for flight information.