The Federal Aviation Administration (FAA) said that an “unintentional deletion of files” was responsible for a computer outage that grounded flights across the United States on Thursday.
The FAA said in a statement that the outage was caused by the “unintentional deletion of files” from a server that supports the system used by air traffic controllers. The agency said that the disruption did not impact safety and that the system was back up and running by the afternoon.
The FAA added that it has launched an internal investigation to determine how the files were deleted in the first place and to ensure that similar disruptions do not occur in the future. The agency said that it is also working to restore any lost data.