On a Friday afternoon in mid-November, the nation's skies went quiet for a few hours when the Federal Aviation Administration halted all air traffic, citing extraordinary circumstances and safety. The stop lifted by evening, but its wake spread across thousands of flights and travelers, a reminder of how much modern life rests on machinery built decades ago. Officials point to aging hardware rather than hackers or artificial intelligence, and they ask Congress for far more money to renew the system, while the people stranded in terminals wait for the sky to return to its ordinary rhythm.
FAA Lifts Nationwide Ground Stop, but Flight Chaos Persists After Thousands of Delays and Cancellations
Thousands of travelers were stranded at airports, with some unable to rebook because airline systems were overloaded, and several flights were diverted.
"It's the old hardware that went down."
Mark
Why does a few hours of grounding cause days of trouble?
Mimi
Because everything is out of position. Planes ended up in cities they weren't scheduled for, and crews are scattered. Retired pilot Mark Stephens said flights will be stuck without crews and hubs lack room for the planes.
Luke
And crew rest rules are part of that, though that's his forecast, not something airlines have confirmed yet.
Mark
Officials said the cause was old hardware. How solid is that?
Mimi
Duffy said the data systems that talk to aircraft showed an inconsistency, and that new IP voice switches stayed up while old hardware failed.
Luke
But he also said they're still working on the details of what happened. Age is the stated explanation, not a finished investigation. He couldn't promise it wouldn't recur.
Mark
What about the AI tool, SMART?
Mimi
It began deploying this week, so people wondered. ASI and Duffy both denied it was involved, and Mullin saw zero evidence of AI or a cyberattack.
Luke
Those are denials from interested parties, plus an ongoing probe. Mullin earlier said they were looking at it. No independent finding yet.
Mark
Were people in the air at risk?
Mimi
Duffy said all 3,000 airborne flights landed safely, and pilots have backup procedures.
Luke
Fair, though the cancellation figures are FlightAware's count as of 9:45 p.m., and they'll likely keep climbing.
Le Pouls
- The FAA froze all US flights around 3 p.m. Eastern Friday, and aircraft in the air were forced to find alternate routes and landing sites.
- Planes diverted to unexpected cities, from Cincinnati to Baltimore to Tijuana, as pilots relied on backup communication systems.
- More than 6,600 flights were canceled as airports from Chicago to Atlanta filled with stranded passengers who could not rebook through overloaded airline systems.
- Officials blame outdated air-traffic hardware, rule out cyberattacks and AI, and seek $50 billion from Congress, but crews and planes remain out of position, and recovery is expected to take days.
On a Friday afternoon in mid-November, the nation's skies went quiet for a few hours when the Federal Aviation Administration halted all air traffic, citing extraordinary circumstances and safety. The stop lifted by evening, but its wake spread across thousands of flights and travelers, a reminder of how much modern life rests on machinery built decades ago. Officials point to aging hardware rather than hackers or artificial intelligence, and they ask Congress for far more money to renew the system, while the people stranded in terminals wait for the sky to return to its ordinary rhythm.
At about 4:11 p.m. Eastern on Friday, Delta Flight 958, a Boeing 767 bound from Los Angeles to New York, turned around nearly four hours into its journey and landed in Cincinnati. It was one of many flights caught when the Federal Aviation Administration halted air traffic nationwide around 3 p.m., citing extraordinary circumstances and safety. Other planes changed course too: a Delta flight from Atlanta landed in Baltimore, and a Volaris flight from Mexico diverted to Tijuana.
By evening, more than 6,600 flights had been canceled. Chicago O'Hare and Atlanta's Hartsfield-Jackson, the world's busiest airport, were hit hardest. Transportation Secretary Sean Duffy said the FAA's data systems had suffered an inconsistency, and that 3,000 airborne flights had all landed safely on backup systems. The stop was lifted around 8:30 p.m.
Duffy and Homeland Security Secretary Markwayne Mullin pointed to the age of the air-traffic control system. They said the new IP voice switches had not failed, and that the old hardware had. Both rejected cyberattack and AI explanations, though speculation had focused on SMART, a new FAA AI tool that had only begun deploying that week. Its maker said it was not involved. Mullin stressed the public was never in danger, and Duffy admitted he could not guarantee it would not happen again. The request to Congress rose from $30 billion to $50 billion.
Retired Delta pilot Mark Stephens described the cockpit view: planes keep flying their plans, switch to digital backups, and stay the course, following the familiar priorities of aviate, navigate, communicate.
On the ground, passengers paid the price. One traveler in Missouri was told to rebook, but could not get through. Amtrak also saw overloaded systems as travelers sought other options. Stephens warned that the recovery would be slow, since crews and aircraft were scattered and major hubs were full. Saturday, he said, would be a difficult reset.
At about 4:11 p.m. Eastern on Friday, Delta Air Lines 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 the flights caught when the Federal Aviation Administration halted air traffic nationwide at around 3 p.m., citing "extraordinary circumstances" and "reasons of safety." The agency lifted the ground stop around 8:30 p.m. Eastern.
Other flights were caught the same way. 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 into and out of the country. Chicago O'Hare led with 395 cancellations, and Atlanta's Hartsfield-Jackson, the world's busiest airport, lost more than 350. Major airports in New York, Boston, Texas and Denver each saw more than 200 flights canceled.
Transportation Secretary Sean Duffy said at a press conference that the FAA's data systems, which communicate with aircraft, had experienced an "inconsistency." Just after 4:15 p.m., he had posted on X that the halt followed a communication issue affecting all Air Route Traffic Control Centers, and that FAA technicians were investigating. He said 3,000 flights were airborne when the stop began, and all landed safely using alternative systems.
Duffy and Homeland Security Secretary Markwayne Mullin blamed the age of the air-traffic control system. Duffy said new IP switches, the voice communication systems meant to replace decades-old analog switches, did not fail. "It's the old hardware that went down," he said, adding that he had already replaced some switches. The two officials asked Congress for $50 billion to modernize the system, up from the $30 billion Duffy proposed in September.
They also tried to close off other explanations. Mullin said he had seen "zero evidence" of a cyberattack or an artificial intelligence problem. Earlier in the day, asked about the AI link, he had said, "That's what we're looking at." Online speculation had focused on SMART, a new FAA AI tool for air traffic control that began deploying this week. Its maker, ASI, said the outage was not based on or a result of SMART or any ASI product, and Duffy said SMART was not at fault. Mullin said there was "no indication" of a link to Microsoft, which had its own service problems this week. He said the public was never in danger and did not want people to assume this was a safety threat or "another 9/11." Duffy said they were still working on the details of the cause and prevention, and that he could not guarantee it would not happen again.
Mark Stephens, a retired Delta pilot, explained what happens in the cockpit. Planes en route continue on their flight plan and then switch to backup methods, using digital tools to reach air traffic control and airline dispatch. Absent an instruction to divert, he said, the approach is to "stay the course" and do what pilots are trained to do: aviate, navigate, communicate. The last nationwide ground stop was in January 2023 and lasted about 90 minutes. Before that, the last was on 9/11.
On the ground, travelers bore the cost. A passenger at Springfield-Branson Airport in Missouri was told all flights were canceled for the day and to rebook, but airline systems were overloaded and he could not get through. Amtrak reported error messages on its website and app and higher-than-normal call volumes due to the airline disruptions.
The recovery will take days. Stephens warned that long delays would become a crew-rest problem, with pilots and flight attendants scattered across the country and planes stranded in cities without crews. He said major hubs lack space for all the aircraft. Saturday, he said, would be a difficult reset.
Citations marquantes
It's the old hardware that went down.— Sean Duffy, Transportation Secretary
Mullin said he had seen zero evidence of a cyberattack or an AI problem.— Markwayne Mullin, Homeland Security Secretary
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