Air traffic operations began recovering across the United States Friday evening following a nationwide ground stop imposed by the Federal Aviation Administration (FAA) after a major telecommunications failure disrupted the country’s air traffic control network.
The FAA ordered the unprecedented suspension of departures at approximately 3:53 p.m. Eastern Time after communications problems affected Air Route Traffic Control Centers (ARTCCs) responsible for managing aircraft across U.S. airspace.
As individual facilities recovered, the FAA began authorizing departures through coordination with its Air Traffic Control System Command Center. The agency issued an advisory at 5:46 p.m. allowing flights to resume progressively, although widespread delays and cancellations continued.
New information has emerged concerning the possible cause of the outage. CBS News reported, citing multiple sources, that an update to the private communications network connecting the nation’s air traffic control system triggered a reboot, resulting in a system crash and communications failure.
The network is reportedly operated by defense and communications technology company L3Harris, which had not publicly commented on the reported malfunction.
Homeland Security Secretary Markwayne Mullin said federal authorities had found no indication that the disruption resulted from a deliberate attack, although investigators had not ruled out all possibilities.
Transportation Secretary Sean Duffy confirmed that FAA technicians were investigating the communications problems affecting the nation’s air traffic control facilities.
The disruption caused extensive operational consequences. Flight-tracking data indicated that thousands of flights were delayed or canceled, while hundreds of aircraft were diverted or otherwise affected by the shutdown.
Airlines faced substantial challenges restoring schedules, with aircraft and crews displaced throughout the national aviation network. International operations were also affected as foreign carriers and aviation authorities adjusted departures bound for the United States.
The incident was the first nationwide FAA ground stop since January 2023, when a failure of the agency’s Notice to Air Missions system temporarily halted domestic departures.
Friday’s communications failure raises renewed concerns about the resilience of U.S. air traffic control infrastructure and the potential consequences of technical changes to systems supporting multiple facilities.
Investigators will now seek to determine precisely how the reported network update caused such widespread disruption, whether appropriate safeguards were in place and what measures are needed to prevent a recurrence.
Although departures were beginning to resume, airlines and airports warned passengers to anticipate continuing delays and cancellations as operations recovered.