Takeoffs from airports throughout the US largely stopped on Friday after the FAA issued a national ground stop "due to extraordinary circumstances and for reasons of safety," while planes in the air will be allowed to land. The FAA tweeted just after 5PM ET that, "There has been a temporary telecommunications outage - out of an abundance of caution all flights have been halted. Every flight has been accounted for and international flights will be handled on a case by case basis." The flight tracking site FlightAware lists 10,494 US flights as delayed and 3,396 flights canceled as of 6:16PM ET.

According to CNN, the last nationwide ground st …

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