KEY POINTS
  • The FAA says a contractor unintentionally deleted files before the outage of alert system.
  • Around 10,000 flights were delayed because of the pilot-alerting system outage.
An American Airlines Airbus A319 airplane takes off past the air traffic control tower at Ronald Reagan Washington National Airport in Arlington, Virginia, January 11, 2023

The Federal Aviation Administration said Thursday that a contractor unintentionally deleted files before an outage of a pilot-alert system that delayed thousands of flights last week.

"A preliminary FAA review of last week's outage of the Notice to Air Missions (NOTAM) system determined that contract personnel unintentionally deleted files while working to correct synchronization between the live primary database and a backup database," the FAA said. Spokespeople for the agency didn't provide further detail.