The Federal Aviation Administration is pausing all domestic flight departures this morning after a computer system outage sparked widespread delays.
The FAA issued an advisory just after 4 a.m. ET saying that technicians were working to address the problem.
More than 4,000 flights within, to and out of the U.S. were delayed as of around 9 a.m. Wednesday, according to the online flight tracker FlightAware.
United Airlines tweeted that the issue was with the FAA’s Notice to Air Missions system, which sends out real-time flight hazards and restrictions to all commercial pilots.
More than 1,500 of those flights were with Southwest Airlines, according to the flight tracker. More than 750 flights were listed as canceled.
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