On a Friday evening, the American sky went quiet as the Federal Aviation Administration ordered a nationwide ground stop, halting hundreds of flights in a rare act that only a handful of times in recent memory has pulled the whole country's air traffic to a standstill. The Homeland Security Secretary moved to calm a nation that remembered 9/11, insisting this was a telecommunications failure rather than an attack, though the cause has not yet been confirmed. Beneath the immediate disruption lies an older story about an air system built on redundancy that proved fragile, and about decades of de
FAA Halts Flights Nationwide in Rare Ground Stop Citing 'Extraordinary Circumstances' and Safety
Hundreds of flights were disrupted and travelers were stranded or inconvenienced; the correspondent reports everyone is safe.
A rocket booster attached to a horse and buggy
Mark
Why does this ground stop stand out so much?
Mimi
It's only the third nationwide grounding in recent decades. The last was in January 2023, after a pilot communications system failed. Before that was 9/11.
Mark
And that's the comparison Secretary Mullin addressed directly?
Mimi
Yes. He said it isn't another 9/11, that people assume so because that was the last nationwide stoppage, and that this is a telecommunications outage.
Luke
Let's be careful there. That's the secretary's characterization. He said he didn't believe it was tied to a specific attack, which is not the same as a confirmed cause.
Mimi
Fair. Miles O'Brien said much the same: no one really knows for sure, or at least isn't saying.
Mark
What's his concern about the system itself?
Mimi
That a system built on redundancy had a systemwide failure. He pointed to the 22 en route centers linked by old landlines, and to equipment like floppy disks and paper strips.
Luke
But the landline theory is speculation. He said there's talk that the connections failed, not that they did. Hacking and modernization trouble were both floated as possible causes, and neither is established.
Mark
What about the Microsoft outage people asked about?
Luke
Nothing in the reporting links the two. It was a question put to him, and he answered about vulnerability in general.
Mimi
What is solid is that hundreds of flights were affected, and that everyone was reported safe.
Il Polso
- A nationwide ground stop froze hundreds of flights in a single evening, and the tracker showed every aircraft in U.S. airspace sitting still.
- Fear of another attack spread quickly, and officials rushed to say a telecommunications outage, not terrorism, was the likely culprit.
- Experts are probing where single points of failure hid in a system meant to be redundant, focusing on landlines linking the 22 regional en route centers.
- The grounding is only the third of its kind in recent decades, and the cause remains unconfirmed as the country waits for an official explanation.
- The episode has exposed aging equipment and years of deferred investment, leaving travelers stranded now and the system facing pressure to rebuild for resilience.
On a Friday evening, the American sky went quiet as the Federal Aviation Administration ordered a nationwide ground stop, halting hundreds of flights in a rare act that only a handful of times in recent memory has pulled the whole country's air traffic to a standstill. The Homeland Security Secretary moved to calm a nation that remembered 9/11, insisting this was a telecommunications failure rather than an attack, though the cause has not yet been confirmed. Beneath the immediate disruption lies an older story about an air system built on redundancy that proved fragile, and about decades of deferred investment in equipment that still depends on technology from another era. The travelers were inconvenienced and the skies were held safe, but the deeper question of how a single failure could ripple across the whole network now waits for an answer.
On Friday evening the runways across the United States emptied. The Federal Aviation Administration issued a nationwide ground stop, citing extraordinary circumstances and reasons of safety, and on a flight tracker shown on PBS NewsHour every plane in the region appeared frozen in yellow. Hundreds of flights had already been disrupted by the time the broadcast aired.
Homeland Security Secretary Markwayne Mullin tried to head off alarm. He said the stoppage was not tied to a specific attack, told the public there was no reason to be scared for their loved ones, and acknowledged why people were comparing it to 9/11, the last time the country had a nationwide stoppage. This, he said, was a telecommunications outage and a very different matter.
Aviation correspondent Miles O'Brien urged caution about what was known. Much was speculated, little was confirmed. What troubled him was that a failure had reached the whole system, which is designed around redundancy. He pointed to the 22 regional en route centers, linked by old landlines, and to a modernization effort still running on equipment dating to the 1940s. The cause could be a hack or could be tied to that struggle to upgrade, and he blamed years of deferred investment in air infrastructure.
The human toll, he said, was inconvenience rather than harm. Travelers were stranded and frustrated, but everyone was safe, and he credited the controllers who keep the aging system running each day. The official cause had not been confirmed when the broadcast ended, and the question of whether the system will finally be made more resilient remains open.
On Friday evening, runways across the United States emptied out. The Federal Aviation Administration issued a nationwide ground stop, citing "extraordinary circumstances" and "reasons of safety." On a flight tracker graphic shown on PBS NewsHour, every plane in U.S. airspace and the surrounding region showed up in yellow, meaning none were moving. Hundreds of flights had been affected by the time the broadcast aired.
Homeland Security Secretary Markwayne Mullin spoke to reporters soon after and moved quickly to head off alarm. He said he did not believe the stoppage was tied to a specific attack. "There's no reason for the public to be afraid or scared for your loved ones," he said, adding that this was not another 9/11. He understood why people were drawing the comparison, he said, because that was the last time the country had a nationwide ground stoppage. This one, he said, was a telecommunications outage, and a very different matter.
PBS NewsHour anchor Amna Nawaz noted how unusual the order was. It is only the third nationwide grounding in recent decades. The most recent came in January 2023, after the failure of a pilot communications system. Information on Friday night was still very limited, she cautioned.
Aviation correspondent Miles O'Brien, speaking with her, was careful about what is known. A lot of speculation was circulating, he said, but no one knew for sure, or at least no one was saying. What concerned him was that a problem had hit the whole system, even though the system is supposed to be built on redundancy. That raised the question of where the single points of failure were and why they existed.
He pointed to the 22 regional en route centers, which manage aircraft at cruise altitude as they cross the country. They are linked to one another by what he called old-fashioned landlines, and there was speculation that the connections between them had failed. What caused such a failure, he said, was an open question. It could have been a hacking event. It could also have been tied to the effort to modernize a system that still relies on floppy disks, paper strips and spinning radars dating to the 1940s. He compared the modernization effort to attaching a rocket booster to a horse and buggy.
Nawaz also raised a question some viewers were asking: whether the grounding was connected to the large Microsoft outage that had been in the news. O'Brien did not draw that connection. His answer was that the system should not be this vulnerable, and that if one layer can be taken down, another should be standing behind it.
He placed the blame on years of deferred investment by Congress and Washington in the nation's air infrastructure. The system, he said, is bursting at the seams, with air travel at an all-time record despite high costs, while the equipment in use dates back many decades. He argued it is time to invest seriously in something more resilient and more redundant.
The human toll, as O'Brien described it, was inconvenience rather than harm. Travelers were extremely inconvenienced, but everyone was safe. He credited the air traffic controllers who keep the aging system working every day.
The cause had not been confirmed when the broadcast ended. What to watch for is the official explanation of the outage, and whether the reliance on landlines and legacy equipment prompts action on redundancy.
Citazioni salienti
There's no reason for the public to be afraid or scared for your loved ones. This isn't another 9/11.— Homeland Security Secretary Markwayne Mullin
No one really knows for sure what caused the outage, but everyone is safe, though extremely inconvenienced.— Miles O'Brien, PBS NewsHour aviation correspondent (paraphrase)
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