Following an initial review, the FAA has now revealed that a contractor “inadvertently deleted files” while attempting to synchronize the US Aviation Mission Notification (Notam) system — All U.S. flights grounded for hours on Wednesday (January 11).
Data from flight schedule analyst Cirium suggests About 21,500 flights scheduled to leave U.S. airports The day of the power outage.
A fix has been rolled out, and other measures to make the system more resilient. The FAA had previously attributed the problem to a “corrupted database file.” It also temporarily ruled out foul play.
The Notam system provides pilots with essential hazard and safety updates that affect the route and must be reviewed prior to takeoff.