FAA issues nationwide groundstop due to "extraordinary circumstances"

The Federal Aviation Administration grounded all flights nationwide Friday afternoon because of communications problems at regional air traffic control centers.. The FAA notice said the ground stop was being imposed “due to extraordinary circumstances and for reasons of safety.” -- https://whdh.com/news/us-world/flights-halted-at-airports-across-us-due-to-air-traffic-control-communications-problems-faa-says/