NOTAM Outage

U.S. FAA Says Flight Personnel Alert System Not Processing Updates after Outage | Newsmax.com

A total of 1,230 flights were delayed within, into or out of the United States as of 7.19 am ET (1219 GMT), flight tracking website FlightAware showed, without citing reasons. Another 103 within, into or out of the country were also canceled.

It looks like there is a major FAA system outage today. Live updates: FAA system outage grounds all US departing flights