On a Friday in mid-November, the nation's skies went quiet when the Federal Aviation Administration halted all departing flights after a communication failure reached every one of its air traffic control centres. The cause, officials say, was not an attacker but an ageing machine: overloaded routers feeding inconsistent data into the radar and the voices that guide aircraft. Roughly 1.5 million travellers felt the pause in their plans, a reminder of how much of ordinary life rests on systems built decades ago. The stop is lifted, but the question it leaves behind is whether the country will re
FAA Lifts Nationwide Ground Stop After Communication Failure Strands 1.5 Million Flyers
An estimated 1.5 million travellers were stranded or affected by cancellations and delays.
Routers overloaded with data, and the whole system was shut down
Mark
Why does this one matter beyond the cancellations?
Mimi
Because it hit every Air Route Traffic Control Centre at once. Only one other nationwide stop has happened since 2001.
Mark
What did officials say caused it?
Mimi
Duffy said routers were overloaded with data and gave inconsistent information, so the system was shut down.
Luke
That's his account, though. The source gives no independent technical review, and the underlying fault hasn't been detailed beyond that.
Mark
Was it a cyberattack?
Mimi
Homeland Security Secretary Mullin said there was no indication of one, and no threat to the country.
Luke
Worth noting that's an official's assessment at this stage, not a published investigation. Trump's remark that it didn't seem like AI or a cyberattack is also his impression, relayed through Fox.
Mark
And the new SMART tool?
Mimi
It had just been rolled out to all 22 centres. Officials and its maker, Air Space Intelligence, reject any link.
Luke
The timing is a coincidence as far as anyone has shown. Nothing in the reporting ties them together.
Mark
What about the $50 billion?
Mimi
Duffy raised the ask from $30 billion, with about $12 billion already secured. He tied the outage to old technology.
Luke
The 1.5 million figure is Cirium's estimate, and the flight counts are FlightRadar24's. Useful, but not official tallies.
Der Puls
- A single communication fault rippled through every air traffic centre in the country, and by evening more than 4,700 flights had been cancelled.
- Some 3,500 aircraft were airborne when the order came, and controllers and pilots had to bring them down safely while the data they relied on grew unreliable.
- Officials scrambled to rule out a cyberattack and AI involvement, even as the president pointed to broken, old infrastructure.
- Transportation Secretary Duffy is pressing Congress for $50 billion in emergency funds, and full normalcy is targeted before Thanksgiving, though crew shortages could slow the climb back.
On a Friday in mid-November, the nation's skies went quiet when the Federal Aviation Administration halted all departing flights after a communication failure reached every one of its air traffic control centres. The cause, officials say, was not an attacker but an ageing machine: overloaded routers feeding inconsistent data into the radar and the voices that guide aircraft. Roughly 1.5 million travellers felt the pause in their plans, a reminder of how much of ordinary life rests on systems built decades ago. The stop is lifted, but the question it leaves behind is whether the country will rebuild that foundation before the next strain arrives.
On Friday, November 13, the Federal Aviation Administration halted departing flights across the entire United States after a communication problem struck all of the country's Air Route Traffic Control Centres. Before the order was lifted, an estimated 1.5 million travellers had been caught up in cancellations. FlightRadar24 counted more than 4,700 cancelled flights and 10,000 delays for the day, with 700 more already cancelled for Saturday. It was the second nationwide stoppage of its kind since the September 11 attacks.
Transportation Secretary Sean Duffy explained that the system's routers had become overloaded and were producing inconsistent information in radar data and in communication with aircraft, which forced the shutdown. Homeland Security Secretary Markwayne Mullin said there was no sign of a cyberattack or threat, and the stoppage was unrelated to earlier Microsoft outages. More than 3,500 aircraft had been in the air; by Duffy's last check, fewer than 400 remained aloft as the rest landed safely.
Duffy blamed old technology and used the moment to press for funding. Where the president had requested $30 billion to rebuild air traffic control, he now seeks $50 billion in emergency money. A plan announced last year aims to build a new system by 2028 at roughly $31.5 billion, with more than $12 billion already secured, though Duffy called that partial. President Trump, too, dismissed a cyberattack or AI as the cause and pointed to old, broken infrastructure.
The FAA had recently extended an AI-supported airspace tool to all 22 centres, which prompted questions, but officials and its maker rejected any link to the outage. The ground stop is over, yet the return to normal will be gradual, limited by crew availability. Duffy expects full operations by the Thanksgiving rush, and Congress's answer to the funding request is what comes next.
On Friday, November 13, the Federal Aviation Administration halted departing flights across the entire United States. The order came after a communication problem hit every one of the country's Air Route Traffic Control Centres. By the time the stop was lifted, an estimated 1.5 million travellers, by the data firm Cirium's analysis, had been caught up in cancellations.
FlightRadar24 put the day's toll at more than 4,700 cancelled flights and 10,000 delayed ones. Another 700 flights were already cancelled for Saturday. The ground stop was the second nationwide stoppage of its kind since the September 11, 2001, attacks.
Transportation Secretary Sean Duffy spoke at a Friday evening press briefing and said the halt followed a communication issue affecting all the centres. In a post on X he said FAA technicians were investigating. He later gave a fuller account: the system's routers had become overloaded with data and began producing inconsistent information, and because of that, the FAA shut things down. He described the inconsistency as showing up in radar data and in communication with aircraft.
Homeland Security Secretary Markwayne Mullin told reporters there was no sign of a cyberattack and no indication the problem posed a threat to the country. He also said the stoppage was unrelated to the Microsoft outages earlier in the week.
Duffy said more than 3,500 aircraft were in the air when the order was issued. They all engaged, he said, and by the time he last checked, fewer than 400 remained in the airspace as the rest landed safely, following the established procedures for such incidents.
He blamed old technology and the overloaded routers, and used the moment to press Congress for more money. At the White House he said the president had asked for $30 billion to rebuild air traffic control, but that he now wanted $50 billion in emergency funding. "What's more important than having an air traffic control system that actually works?" he asked, describing the aim as new hardware, new software and new telecommunications.
The administration announced a plan last year to build a new air traffic control system by 2028, at a cost of roughly $31.5 billion. More than $12 billion was secured when the "One Big Beautiful Bill" Act passed. Duffy said that portion would be finished before President Trump leaves office, but called it partial funding.
President Trump, in a call reported by Fox News correspondent Peter Doocy, said it did not seem to be a cyberattack or AI. He instead pointed to a bunch of old, broken infrastructure that the FAA relies on to keep planes in the sky.
The AI question was raised because the FAA had, days earlier, extended a new AI-supported tool, Strategic Management of Airspace, Routes and Trajectories, or SMART, to all 22 of its air traffic centres. Administration officials have dismissed any AI involvement, and Air Space Intelligence, the company behind the system, rejected any suggestion that it caused the stoppage.
The ground stop is over, but Duffy warned that the return to normal would be slow, constrained by crew availability. He said he expects operations to be fully back by the Thanksgiving travel rush. Congress's response to the $50 billion request is the next thing to watch.
Bemerkenswerte Zitate
What's more important than having an air traffic control system that actually works?— Transportation Secretary Sean Duffy
There was no indication of a cyberattack or threat to the US, and the stop was unrelated to this week's Microsoft outages.— Homeland Security Secretary Markwayne Mullin (paraphrased)
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