On a Friday afternoon, the United States paused its skies in a way few modern systems have ever required. The Federal Aviation Administration halted all departures nationwide after a communications failure struck its air traffic control centres, leaving aircraft already airborne to land while planes on the ground stayed where they were. Officials insist the disruption was an outage rather than an attack, though no one is yet willing to close the door entirely on the question of cause. It is a reminder, in an age that depends on invisible signals to keep steel machines apart in the air, of how
US lifts nationwide ground stop after four hours of air traffic control failure, leaving thousands of flights delayed
Thousands of passengers were stranded or delayed at airports across the US and abroad as more than 8,000 flights were cancelled.
Aircraft that had pushed back from their gates were told to return to them.
Mark
Why does this one stand out from an ordinary bad day for airlines?
Mimi
Because a nationwide ground stop has happened only three times. September 11, the 2023 notice system failure, and now this. Over 8000 cancellations is the scale of it.
Luke
Keep the figure honest, though. The 8000 comes from FlightRadar24, a tracking service, not from the FAA or the airlines.
Mark
And the cause? Officials seem to be saying two things at once.
Mimi
Mullin called it a telecommunication outage across the FAA and said there was no indication of a threat. But he also said nothing could be ruled out.
Luke
That's the gap. No cyberattack is suspected, not no cyberattack. CNN's two law enforcement sources said preliminary information, and preliminary can change.
Mark
What about the link to the Microsoft outage the day before?
Luke
Mullin said he saw no reason to connect them. That's an absence of evidence, not a finding.
Mimi
The passengers' side is vivid. Lennox was taxiing, sent back, and put out of the plane into the terminal.
Mark
Is the funding request connected?
Luke
It's context, not a diagnosis. Congress approved $US12.5 billion last year for the communications system, and $US30.1 billion more was requested Friday for other issues. Nothing here says the money would have prevented this.
Mimi
Duffy's own caution is the practical part: delays will linger, so check with your airline.
Der Puls
- A nationwide ground stop froze US departures on Friday, sending planes back to their gates within minutes of pushing back.
- More than 8,000 flights were cancelled as the disruption rippled across North America and into Europe.
- Officials are working to determine the cause, with Homeland Security saying no threat is indicated and a cyberattack not suspected.
- Airlines are restarting operations case by case, but travellers are warned that delays will linger well after the stop was lifted.
- Attention now turns to the FAA's equipment troubles and a $30.1 billion funding request that Congress must weigh.
On a Friday afternoon, the United States paused its skies in a way few modern systems have ever required. The Federal Aviation Administration halted all departures nationwide after a communications failure struck its air traffic control centres, leaving aircraft already airborne to land while planes on the ground stayed where they were. Officials insist the disruption was an outage rather than an attack, though no one is yet willing to close the door entirely on the question of cause. It is a reminder, in an age that depends on invisible signals to keep steel machines apart in the air, of how much of ordinary travel rests on systems few passengers ever think about.
On Friday afternoon, planes that had already pushed back from their gates in the United States were ordered to return. Dennis Lennox, a Republican strategist, was on a plane taxiing toward Detroit and then Los Angeles when the crew turned it around, and passengers were taken off and left in the terminal. The Federal Aviation Administration had issued a nationwide ground stop after a communications issue affected all Air Route Traffic Control Centres. Planes already in the air could land, but nothing on the ground could take off. The order was lifted more than four hours later.
The cost was enormous. Airlines cancelled more than 8,000 flights, and thousands more were delayed, with effects reaching Canada and Europe. In airports from Boston to Seattle, travellers crowded departure halls. Louise Maher, 47, was still hoping to fly from Newark to London that night. "I might cry at some point but not yet," she said.
Homeland Security Secretary Markwayne Mullin described the stop as a precaution and a telecommunications outage throughout the FAA, with no sign of a threat to the United States. Preliminary information from law enforcement suggested a cyberattack was not to blame, though nothing has been fully ruled out. Duffy warned that recovery would take time, and United Airlines said international departures were being managed one by one. The outage also lands in the middle of a debate over the FAA's ageing equipment, as the agency and White House asked Congress for another $30.1 billion. The official explanation and Congress's response are what to watch next.
On Friday afternoon in Washington, aircraft that had pushed back from their gates were told to return to them. At MBS International Airport in Michigan, Dennis Lennox, a Republican strategist, was on a plane already taxiing for takeoff, bound for Detroit and then Los Angeles, when the order came. The crew sent the plane back to the gate. Within a minute or two, he said, he had learned more than the airline had told him, and passengers were not even allowed to stay aboard. They were taken off and left in the terminal.
The Federal Aviation Administration had issued a nationwide ground stop, citing extraordinary circumstances and reasons of safety. US Transportation Secretary Sean Duffy said it followed a communication issue affecting all Air Route Traffic Control Centres. The order meant planes already airborne could land, but nothing on the ground could depart. It was issued on Friday afternoon (about 8am Saturday AEDT) and lifted at 8.15pm Washington time (12.15pm Saturday AEDT), more than four hours later.
The damage was large. According to the flight-tracking service FlightRadar24, airlines cancelled more than 8000 flights, and thousands more were delayed. US airspace handles about 45,000 flights a day. The disruption did not stay inside the country: flights from Canada and Europe were cancelled too. From Boston to Seattle and New York to Los Angeles, passengers crowded departure halls and airline desks while boards filled with delays and cancellations. Louise Maher, 47, was still hoping to fly from Newark to London that night, though her British Airways flight had been warned of air traffic control restrictions. "I might cry at some point but not yet," she said.
The cause was not immediately clear. Homeland Security Secretary Markwayne Mullin, speaking to reporters at the White House, said the stop was ordered out of an abundance of caution and that there was no indication it was a threat to the United States. He described it as a telecommunication outage throughout the FAA. He also said nothing could be ruled out at this point, and that he saw no reason to link it to the outage that affected Microsoft systems worldwide the previous day. CNN reported that two law enforcement officials said preliminary information indicated a cyberattack was not to blame. The FAA was contacted for further comment. Mullin added that everyone in the air would be brought safely to the ground and said, "This isn't another 9/11."
It is only the third nationwide ground stop in US history. The first came during the September 11, 2001 attacks. The second was in 2023, when the FAA's Notice to Air Missions system failed; that outage lasted about 12 hours in total, though departures resumed after about 90 minutes. Former FAA deputy administrator Daniel Elwell told Fox News the stop was a sensible way to declutter the airspace while the technical issue was addressed. He called it a real pain in the neck but the safest way to go.
Even with systems restored, Duffy warned that recovery would be slow. He told people at airports to check with their airlines, noting that not every flight would leave right away. United Airlines, a main carrier between the US and Australia, said on X that the FAA was managing international departures case by case. It has several flights to Australia's east coast due to leave late Friday night, Los Angeles time.
The outage lands amid a debate over the FAA's equipment. Last year Congress approved $US12.5 billion ($18.5 billion) to fix the agency's ageing communications system. On Friday the FAA and White House asked Congress for another $US30.1 billion to address other issues. The FAA has also begun rolling out an AI tool, Strategic Management of Airspace, Routes and Trajectories, known as SMART. Asked whether Friday's problems could be AI-related, Mullin said, "We call it SI around here, remember," a nod to the Trump administration's attempt to rename artificial intelligence as superintelligence.
What to watch now is the official explanation for the failure, and how Congress responds to the $US30.1 billion request.
Bemerkenswerte Zitate
There is no indication, and we had no reason to believe as of right now, that this was a threat to the United States. This was a telecommunication outage throughout FAA.— Markwayne Mullin, US Homeland Security Secretary
The ground stop, while a real pain in the neck, is the safest way to go.— Daniel Elwell, former FAA deputy administrator
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