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FAA Ground Stop Lifted After Air Traffic Control Outage Halts Flights — AI-generated representative image: Stranded travelers wait inside a US airport terminal as flights remain grounded during an air traffic control outage.

Editorial Team

Nationwide aviation shutdown lasted over four hours, causing nearly 2,000 cancellations and widespread airline delays

The Federal Aviation Administration (FAA) ordered a rare nationwide ground stop for all departing flights across the United States on Friday, citing a communication issue affecting every Air Route Traffic Control Center. The emergency directive took effect at 3:54 PM Eastern Time and remained in place for roughly four and a half hours before being lifted, although flight disruptions continued into the evening.

Around 1,900 flights were canceled and 10,500 delayed as of 6:00 PM Eastern Time, according to flight-tracking service FlightAware. International flights arriving in the US were handled on a case-by-case basis during the shutdown.

The disruption grounded air travel across the country at a moment when the FAA had only recently deployed a new artificial intelligence system intended to modernize flight routing. The incident highlights the vulnerability of aging air traffic control infrastructure that remains central to daily travel for millions of passengers and the broader economy.

Authorities have said they do not believe the outage resulted from malicious activity, but the scale of the shutdown underscores how a single technical failure can ripple across the national aviation network.

What Officials Have Confirmed

US Transportation Secretary Sean Duffy attributed the ground stop to a "communication issue impacting all Air Route Traffic Control Centers" and said FAA technicians were investigating. He later described the air traffic control system as "incredibly old," explaining that switches and routers became overloaded with data and began producing inconsistent information.

Homeland Security Secretary Markwayne Mullin characterized the event as a "telecommunications outage" and said authorities do not believe it was the result of foul play. Preliminary reports cited by CNN, based on two law enforcement officials, similarly indicated the disruption was not caused by a cyberattack.

The National Weather Service also reported nationwide internet and communications problems, warning that some weather information on its websites could be unavailable or outdated while technicians worked to restore services.

Background and Past Ground Stops

Nationwide ground stops are exceptionally rare. The previous one was ordered in January 2023 following a failure of the system that provides safety notices to pilots. Before that, the last full shutdown occurred in the immediate aftermath of the September 11, 2001 terrorist attacks.

Friday's outage came just days after the FAA announced the nationwide rollout of SMART, a new AI-powered system designed to optimize flight routes and reduce delays. The system was deployed across all 22 regional air traffic control centers, though authorities have not established whether it played any role in the disruption.

Similar technical failures have disrupted air travel worldwide this year. In September, a communications outage halted flights at major airports in the northeastern US, while a software malfunction caused widespread cancellations across Britain. Greece temporarily closed its airspace in January, and Italy halved its air traffic capacity following a technical failure in October.

Operational Details and Impact

The ground stop instructed all departing aircraft to remain on the ground until further notice, with the FAA citing unspecified safety concerns in its advisory. The directive was lifted around four and a half hours after it began, but the backlog of grounded flights continued to produce cancellations and delays through the evening.

Duffy expanded on the technical failure during a news conference, stating that the system's switches and routers "actually got overloaded with data" and "started to give us inconsistency in the data from those routers." He emphasized that FAA technicians were actively investigating and promised immediate updates as more information became available.

Current Status and What Comes Next

The ground stop has been lifted and flights are resuming, though airlines continue to work through a significant backlog of cancellations and delays. FAA technicians are investigating the root cause of the router overload that triggered the outage.

Authorities have not yet established any connection between the disruption and the newly deployed SMART system, and no official determination has been made regarding the precise sequence of the technical failure. Additional information is expected as the investigation progresses.