US Officials Blame Legacy Systems for Nationwide Flight Ground Stop

US air traffic operations resumed late Friday after a nationwide ground stop grounded flights for four hours, paralyzing travel across the country.

The Federal Aviation Administration lifted the order at 8:15 p.m. Eastern Time following a major communications failure that disrupted thousands of scheduled routes.

The incident left hundreds of thousands of passengers stranded, with nearly 6,000 flights canceled, according to data from FlightAware. At major hubs, travelers faced sudden cancellations and confusion as airline staff struggled to provide updates. Some passengers reported being pulled off aircraft moments before departure, while others remained stuck on taxiways for hours.

Joseph Anderson, 72, was among those caught in the chaos while attempting to travel from Las Vegas to Oakland. “We’re trying to debate whether or not we need to reschedule or drive or what, but if the whole country is stopped, that means the highways are going to be jammed too,” he told France 24.

Secretary of Transportation Sean Duffy attributed the outage to a failure within aging telecommunications infrastructure. He described the incident as a result of “decades-old equipment,” specifically citing legacy switches and routers that rely on 1980s-era copper lines. The system became overloaded, leading to a total collapse of functionality across air traffic control facilities.

“This is a legacy system problem,” Duffy said. “We have old, old switches, old routers. It’s an old system that went down, and went down everywhere.”

Homeland Security Secretary Markwayne Mullin clarified that there was no evidence of foul play or hostile intent. Officials explicitly ruled out cyberattacks or artificial intelligence interference as causes for the outage. Authorities stated there was no connection between this failure and the separate global Microsoft outage that impacted email and business systems earlier in the week.

This event marks only the second time such a broad alert has been issued in United States airspace since the September 11, 2001, terrorist attacks. The only other comparable incident occurred in January 2023, when a failure in a pilot notification system prompted a similar nationwide pause.

Duffy had formally requested that Congress approve $30.1 billion in funding to modernize the national air traffic control system. Following the lift of the ground stop, he reiterated the urgency of the request.

“I’m going to say it a million times: the Congress has to give the resources to the president so he can finish this bill,” Duffy said.

Airlines are now resuming normal operations, though backlogs at major airports are expected to persist.

For some, the disruption provided an unexpected, if frustrating, extension to their travel plans. “We’re blessed that our friends are coming back to pick us up,” said Kathy Sommers, who was stranded in Las Vegas. “So one more night to play cards.”

“It will take us time (to) resume normal operations… Our top priority is the safety of you and your family when you fly,” said Secretary of Transportation Sean Duffy.

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