The U.S. Secretary of Transportation Sean Duffy said on X that the FAA has “issued a nationwide ground stop for all U.S. airports following a communication issue impacting all Air Route Traffic Control Centers. FAA technicians are investigating the issue. We will provide immediate updates as we have them.”

The Air Current has confirmed earlier FAA messages issued to airlines ordering a nationwide departure ground stop across the U.S. and Canada “due to several impacts to ATC Frequencies and/or Radar capabilities.” According to the message, the FAA command center told airlines it does not have further information on the “timing or cause of this outage.”

UPDATE 1:39 pm PT: A dispatcher at one U.S. carrier told TAC that the FAA command center had communicated that the outage was affecting 10 enroute centers “and growing.”

UPDATE 1:49 pm PT: A spokeswoman for United Airlines tells TAC that it has activated its Emergency Operations Center as part of this ongoing nationwide ground stop issued by the FAA.

The FAA did not immediately respond to a request for comment.