On a Friday afternoon in mid-November, the American sky was asked to hold still. The Federal Aviation Administration grounded every departing flight across the country after a telecommunications failure overwhelmed the switches and routers that link air route traffic control centres, the unseen network that guides aircraft through the nation's airspace. Officials insist no attacker was involved and that no one was ever in danger, yet the stillness stranded thousands of travellers and exposed how much modern flight depends on systems that are meant to fail gracefully and did not. It is only the
FAA Lifts Nationwide Ground Stop After Telecom Outage Strands Thousands of US Flights
Tens of thousands of travellers were stranded, with many passengers held on planes or in airports for hours without clear information.
"It's going to be slow," the transportation secretary warned as airspace reopened.
Mark
Why does a ground stop like this matter so much, even though it only lasted about four hours?
Mimi
Because the numbers behind those hours are huge. Roughly 11,000 flights and 1.5 million passengers were still scheduled to depart after 4pm, and over 4,700 flights were cancelled that day.
Mark
And it's rare, right?
Mimi
Third nationwide stop of all departures since September 11, 2001. That's the context officials themselves reached for.
Luke
Worth being careful there. Mullin said it wasn't another 9/11 and that nobody was in danger. That's his statement; the cause itself comes from Duffy's account.
Mark
What is that account?
Mimi
Switches and routers overloaded with data and went down, affecting the air route traffic control centres. Duffy said radar and communications weren't totally lost.
Luke
But that's an explanation from officials, given the same evening. Bartsch asked why redundancy didn't kick in, and his comment came before Duffy's details. We don't have an answer on the backups.
Mark
What about the passengers?
Mimi
Erdodi's frustration was about information. He understood a tech failure could happen, he just wanted someone to tell him what was going on.
Luke
And the $50bn upgrade figure is Duffy's ask. Nothing in the reporting ties it to this specific failure.
El Pulso
- At 3:54pm Eastern, every departing aircraft in the United States was ordered to stay put, the third nationwide ground stop since 9/11.
- Switches and routers at air route traffic control centres overloaded and failed, while officials insisted radar and communications never fully went dark.
- Around 4,700 flights were cancelled and 10,000 delayed, and passengers were held on tarmacs and in terminals with almost no clear guidance.
- Airspace reopened after more than four hours, but Transportation Secretary Duffy warned recovery will be slow, tied to pilot and crew availability.
- Questions about why backup systems did not engage are mounting, and Duffy is pressing for $50bn in air traffic upgrades before Thanksgiving travel peaks.
On a Friday afternoon in mid-November, the American sky was asked to hold still. The Federal Aviation Administration grounded every departing flight across the country after a telecommunications failure overwhelmed the switches and routers that link air route traffic control centres, the unseen network that guides aircraft through the nation's airspace. Officials insist no attacker was involved and that no one was ever in danger, yet the stillness stranded thousands of travellers and exposed how much modern flight depends on systems that are meant to fail gracefully and did not. It is only the third time since 2001 that the nation has paused its skies in this way, a reminder of how quickly an ordinary connection can become a shared crisis.
At 3:54pm Eastern on Friday, the Federal Aviation Administration told every departing aircraft in the United States to stay where it was. It was only the third nationwide ground stop of departures since the September 11 attacks, and the order cited "extraordinary circumstances and reasons for safety."
The cause, officials said, was a telecommunications outage at the air route traffic control centres that guide flights across the country. Switches and routers were overloaded with data and went down. Homeland Security Secretary Markwayne Mullin said no cyberattack was involved and that the public was never in danger. Airspace reopened at 8:15pm, but Transportation Secretary Sean Duffy warned that the return to normal would be slow, dependent on pilots and flight attendants being in the right place.
At Los Angeles airport, Nicholas Erdodi, who had travelled from New Zealand for a conference in Chicago, described more than twenty hours of travel followed by six more hours after passengers were made to leave their plane. He had been rebooked but did not know whether his flight would leave. "Someone needs to tell us," he said. Across the country, tens of thousands of travellers were in similar limbo.
Experts were already asking harder questions. Aviation safety specialists pointed to the twenty-one centres where the trouble concentrated, and a law professor noted that aviation is built on redundancy, so the failure of backups to engage immediately was troubling. Duffy acknowledged the stranded travellers and called for $50bn in upgrades.
The timing is unforgiving. Thanksgiving travel begins in less than two weeks, and analysts warn that rescheduling could take days, with knock-on delays rippling through connected airline networks.
At 3:54pm Eastern on Friday, the Federal Aviation Administration told every departing aircraft in the United States to stay where it was. The order cited "extraordinary circumstances and reasons for safety." It was only the third nationwide ground stop of all departures since the September 11, 2001, attacks.
The cause, the FAA said, was a telecommunications outage affecting air route traffic control centres, the facilities that guide flights as they cross the country. Transportation Secretary Sean Duffy later explained that switches and routers had become overloaded with data and gone down. He said the incident did not involve a total loss of communications or radar. Homeland Security Secretary Markwayne Mullin said no cyberattack was linked to the stoppage and that the public was never in danger. "Everybody's safe," he said, adding that this was not "another 9/11."
Airspace reopened at 8:15pm Eastern, after more than four hours. Duffy warned that the reopening would not bring a quick return to normal. "It's going to be slow," he said, telling passengers to check with their airlines. How fast flights resume, he said, depends on the availability of pilots and flight attendants, and officials were trying to move as many flights as possible on Friday night.
The scale of the disruption was large. Aviation analytics firm Cirium said that after 4pm Eastern, about 11,000 flights carrying more than 1.5 million passengers were still scheduled to leave US airports. By 7:05pm, at least 827 flights had been diverted: 670 returned to their departure airports and 157 landed elsewhere. Aircraft already airborne were allowed to continue to their destinations, and international flights were handled case by case, with some allowed to depart. According to FlightRadar24, more than 4,700 flights were cancelled and 10,000 delayed on Friday, with another 700 already cancelled for Saturday. Analysts said airlines could need days to restore their schedules.
At Los Angeles international airport, Al Jazeera's John Hendren spoke with Nicholas Erdodi, who had travelled from New Zealand and was trying to reach a conference in Chicago. He said he had been travelling for 16 to 18 hours, then spent six more at the airport after passengers were made to leave their plane. "The challenge is you cannot ask anyone here what to do," he said. He said the lack of information bothered him, along with finding a hotel for the night and the cost. He had been rebooked but did not know whether his next flight would leave. "I work in tech, I understand what could be going on, but someone needs to tell us," he said.
Outside experts focused on where the failure sat and why it spread. Todd Curtis, an aviation safety expert and chief executive of AirSafe.com, said the problems appeared concentrated in the 21 air route traffic control centres, one in Alaska and 20 in the lower 48. They handle aircraft moving between regions through multiple handoffs between controllers. Ron Bartsch, a professor of international aviation law at the University of the South Pacific, speaking before Duffy gave details, questioned why backups did not engage. "The whole aviation community is based on redundancy," he said, and the failure of a redundant system to kick in immediately raised more questions than answers.
Duffy acknowledged that tens of thousands of travellers had been stranded and called for $50bn in upgrades to the nation's air traffic control system.
The calendar adds pressure. Duffy said it will take time to get back to capacity but expected operations to be back up and running for the heart of Thanksgiving travel, which begins in less than two weeks and is usually among the busiest periods of the year. Curtis cautioned that even with the technical problem resolved, rescheduling aircraft would take more than a day. Because many airlines run interconnected networks with changes at major hubs, getting everyone to their destinations could be a hassle. Passengers are advised to check flight status with their airlines directly.
Citas Notables
It's going to be slow.— Transportation Secretary Sean Duffy
I work in tech, I understand what could be going on, but someone needs to tell us.— Nicholas Erdodi, stranded passenger at Los Angeles airport
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