The high-profile FAA system shutdown that occurred in January 2023—the first nationwide ground stop since 9/11—was caused by a corrupted database file within the NOTAM (Notice to Air Missions) system. The NOTAM system is critical for aviation safety as it provides pilots and flight crews with essential real-time information about runway closures, equipment outages, and other hazards along a flight path. An investigation revealed that contract personnel accidentally deleted files while working to synchronize a primary and backup database, leading to a system-wide failure that prevented the distribution of updated safety information. Because pilots are legally required to review NOTAMs before takeoff, the FAA was forced to halt all domestic departures for several hours until the system could be restored and verified. In 2026, the FAA has implemented much more robust "fail-safe" protocols and is in the final stages of a multi-year modernization project to replace the aging legacy infrastructure with a more resilient, cloud-based architecture to ensure that a single file corruption can never again paralyze the entire United States' national airspace system.