FAA meltdown explained: What is NOTAM?

The failure of a system that alerts pilots and other flight personnel about hazards and other key information led to the temporary on Wednesday morning.

From about 7am to 9am, the FAA halted all US domestic departures, a disruption that impacted at least 4,000 scheduled flights, in the first nationwide ground stop since September 11, 2001.

The FAA the disruption was caused by an outage in the system that alerts pilots to hazards and changes to airport facilities and procedures that had stopped processing updated information.

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