On January 11, 2023, U.S. flights were grounded or delayed as the Federal Aviation Administration (FAA) attempted to fix a system outage. FAA paused all flight departures until 9 a.m. The outage was the first time since September 11, 2001, that the FAA issued a nationwide ground stop in the United States.
A preliminary investigation of the incident demonstrated to FAA investigators that a "damaged database file" may have caused the outage of the FAA's Notice to Air Missions (NOTAM) system, responsible for notifying pilots of safety hazards.