On a Friday afternoon, the nation's skies were abruptly emptied when the Federal Aviation Administration halted all US flights, citing safety, and the stop was lifted only after more than 6,600 flights had been canceled. Officials traced the disruption to a communications inconsistency in aging air-traffic control hardware, rejecting early suspicions of artificial intelligence or cyberattack, though the deeper cause remains unsettled. It is a reminder that the invisible machinery binding millions of journeys together is only as dependable as the decades-old equipment beneath it. Travelers, pil
FAA Lifts Nationwide Ground Stop, but Flight Chaos Set to Linger for Days After Thousands Canceled
Thousands of passengers were stranded in airports nationwide, with more than 6,600 flights canceled and others diverted, leaving travelers unable to rebook.
"It's the old hardware that went down."
Mark
Why does a few hours of grounded planes mean days of trouble?
Mimi
Because the planes and crews end up in the wrong cities. Retired pilot Mark Stephens said crews will be scattered and aircraft stuck without anyone to fly them, and hubs lack room for all the planes.
Luke
And crew rest limits compound that. But that's a pilot's forecast, not a count of how many days it will take.
Mark
What did officials say caused it?
Mimi
Duffy described an inconsistency in data systems that communicate with aircraft, and blamed old hardware. He said newer IP voice switches stayed up.
Luke
Careful there. He also said they're still working on the details. The age explanation is the officials' account, not a finished investigation.
Mark
What about the AI question?
Mimi
SMART began deploying this week, so people asked. ASI and Duffy said it wasn't responsible, and Mullin said he'd seen zero evidence of AI or cyber involvement.
Luke
Mullin had also said earlier that they were looking at it. The denials are statements, not published findings.
Mark
How does that sit with the $50 billion request?
Mimi
Officials tied the failure to aging infrastructure and asked for more than the $30 billion floated in September.
Luke
Worth noting the cause isn't settled, and Duffy couldn't promise it won't recur. The cancellation figure of 6,600 is FlightAware's count as of 9:45 p.m., and it may have grown.
Der Puls
- The FAA froze every US flight on Friday afternoon, and the sky went silent in the middle of countless journeys.
- Planes were turned around mid-route, with a Delta jet bound for New York landing in Cincinnati and another diverting to Baltimore.
- More than 6,600 flights were canceled, and stranded passengers found airline systems too overloaded to rebook them.
- Officials blamed aging hardware and a data inconsistency, while questions about AI and cyberattacks hung unresolved in the air.
- Duffy is asking Congress for $50 billion to modernize air-traffic control, and airlines face days of scrambling to reposition crews and planes.
On a Friday afternoon, the nation's skies were abruptly emptied when the Federal Aviation Administration halted all US flights, citing safety, and the stop was lifted only after more than 6,600 flights had been canceled. Officials traced the disruption to a communications inconsistency in aging air-traffic control hardware, rejecting early suspicions of artificial intelligence or cyberattack, though the deeper cause remains unsettled. It is a reminder that the invisible machinery binding millions of journeys together is only as dependable as the decades-old equipment beneath it. Travelers, pilots, and crews now face a slow and uncertain recovery while the nation debates how much to invest in the systems it has long taken for granted.
At 4:11 on Friday afternoon, Delta Flight 958, a Boeing 767 on its way from Los Angeles to New York, turned around nearly four hours into the trip and landed in Cincinnati. It was one of many planes redirected after the Federal Aviation Administration halted flights across the country, citing safety and "extraordinary circumstances." The stop began around 3 p.m. Eastern, and about 3,000 aircraft were in the air when it took hold. All of them, officials said, landed safely.
Transportation Secretary Sean Duffy described an "inconsistency" in the data systems that talk to airplanes, a communications failure touching every Air Route Traffic Control Center. He pointed to old hardware rather than anything newer, saying the modern voice switches had not failed and that the old equipment had. Homeland Security Secretary Markwayne Mullin insisted the public was never in danger, urging people not to imagine "another 9/11." Both men acknowledged they could not yet say exactly what happened or guarantee it would not happen again. The FAA lifted the stop around 8:30 that night.
By then the damage had spread. More than 6,600 flights were canceled, with Chicago O'Hare and Atlanta's Hartsfield-Jackson among the hardest hit. Passengers, many of them stranded far from home, found that the disruption was no airline's fault, which left them with little claim on meals or hotel rooms. At Springfield-Branson in Missouri, one traveler was told to rebook, but the overwhelmed airline systems would not let him through. Even Amtrak's app faltered under the surge of people looking for another way to move.
For the industry, the hard work has only begun. Retired pilot Mark Stephens explained that planes already in the air could keep flying their plans and rely on backup links, staying the course as pilots are trained to do. The harder problem lies on the ground, where crews and aircraft now sit in the wrong cities, and rest rules threaten to strand people who cannot legally fly. Saturday, he warned, will be a very difficult reset, and days of recovery lie ahead while the cause remains officially unexplained.
At 4:11 p.m. Eastern on Friday, Delta Flight 958, a Boeing 767 bound from Los Angeles to New York's JFK, turned around almost four hours into its trip and diverted to Cincinnati. It was one of many planes redirected after the Federal Aviation Administration halted flights across the country, citing "extraordinary circumstances" and "reasons of safety."
The ground stop was called around 3 p.m. Eastern. Just after 4:15, Transportation Secretary Sean Duffy said it followed a communication issue affecting all Air Route Traffic Control Centers. At a press conference, he described an "inconsistency" in the FAA's data systems that communicate with airplanes. About 3,000 flights were airborne when the stop began, he said, and all landed safely using alternative systems. The FAA lifted the stop around 8:30 p.m. Eastern.
Other diversions followed. A Delta flight from Atlanta to JFK changed course over the Eastern Seaboard and landed in Baltimore. A Volaris flight from Puebla, Mexico, headed for Los Angeles, diverted to Tijuana, just south of the border. Delta and Volaris did not immediately respond to requests for comment.
By 9:45 p.m. Eastern, FlightAware data showed more than 6,600 flights canceled within the US or in or out of the country. Chicago O'Hare led with 395 cancellations, and Atlanta's Hartsfield-Jackson, the world's busiest airport, had more than 350. Major airports in New York, Boston, Texas and Denver each saw more than 200. Because the disruption was not the airlines' fault, passengers have little recourse for meals or hotels. At Springfield-Branson Airport in Missouri, one passenger was told all flights were canceled for the day and to rebook, but the overloaded airline systems wouldn't let him through. Amtrak said its website and app were returning error messages and that call volumes were higher than normal because of the airline problems.
Duffy and Homeland Security Secretary Markwayne Mullin pointed to the age of the air-traffic control system. Duffy said new IP switches, the voice communication systems meant to replace decades-old analog switches, had not gone down. "It's the old hardware that went down," he said, adding that he had already replaced some switches alongside President Trump. The two officials asked Congress for $50 billion to modernize the system, up from the $30 billion pitched in September. Duffy said they were still working out exactly what happened and how to prevent it, and when asked whether the flying public should feel safe, he said he could not guarantee it wouldn't happen again.
Mullin said the public was never in danger and that "all your loved ones are safe." He called it a communications issue and said he did not want people to assume a safety threat or "another 9/11." He said he had seen "zero evidence" of a cyberattack or an AI problem. Earlier in the day, asked whether an AI system might be involved, he had said, "That's what we're looking at." The question arose because SMART, a new FAA AI tool for air traffic control, began deploying this week. Its maker, ASI, said the issues were not based on or a result of SMART or any ASI product. Duffy said SMART was not at fault, and Mullin said there was no indication of a link to Microsoft, which had faced major service problems this week.
Retired Delta pilot Mark Stephens told Business Insider that planes already en route can keep flying their plan and then use backup methods, including digital links to air-traffic control and airline dispatch. Unless told to divert, he said, the approach is to stay the course and do what pilots are trained to do: aviate, navigate, communicate. The previous nationwide ground stop was in January 2023 and lasted about 90 minutes; before that, it was 9/11.
The larger problem now is repositioning. Stephens warned that long delays turn into a crew rest nightmare, with pilots and flight attendants scattered across the country, planes stranded in cities without crews, and major hubs lacking space for all the aircraft. Saturday, he said, will be a very difficult reset. Airlines face days of recovery, and the cause remains officially unexplained.
Bemerkenswerte Zitate
It's the old hardware that went down.— Transportation Secretary Sean Duffy
Tomorrow is going to be a very difficult reset as pilots and flight attendants will be all over the country.— Mark Stephens, retired Delta pilot
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