A power outage at the John Wayne Airport in Southern California caused the delay of a number of flights on Sunday as air traffic controllers had to communicate with pilots via radio. The power outage lasted for a little more than an hour according to Ian Gregor, a spokesperson for the Federal Aviation Administration (FAA). At the time of the power outage, the tower had been operating on backup generator power and had been since Friday, when commercial power failed.
The backup generator stopped working at 11:42 am Sunday morning and another FAA spokesperson, Mike Fergus, said that FAA technicians responded and had commercial power back by 1:00 pm. A total of 10 flights were delayed from departing by about a half an hour as air traffic controllers guided pilots during their landings via radio.
See the original Google News article for more details.