Air travel across the United States faced widespread disruption after a nationwide flight shutdown grounded aircraft for several hours following a major communications outage in the country’s air traffic control system.
The Federal Aviation Administration (FAA) lifted the nationwide groundstop after approximately four hours, allowing flights to resume. However, passengers continued to face delays, cancellations and uncertainty as airlines worked to clear the backlog.
According to flight-tracking website FlightAware, nearly 6,000 flights were cancelled, including some international services, leaving hundreds of thousands of travellers stranded at airports across the country.
Airports reported crowded departure halls, aircraft waiting on taxiways and long queues at airline counters as passengers searched for alternative travel arrangements.
Some travellers were even asked to leave their aircraft shortly before departure, while others received conflicting information about delays and cancellations.
Why did the US suddenly stop all flights?
The nationwide flight shutdown was triggered by a major communications failure involving outdated technology used by the US air traffic control system.
US Transportation Secretary Sean Duffy said the outage was caused by ageing infrastructure, including old switches, routers and copper telephone lines dating back decades.
He described the incident as a legacy technology problem, explaining that the communications system became overloaded and failed across the country.
The US government said there was no evidence that the disruption resulted from a cyberattack, artificial intelligence attack or other hostile activity.
Homeland Security Secretary Markwayne Mullin also ruled out any connection with a separate Microsoft outage that had affected businesses and public services.
The incident prompted renewed calls to modernise the country’s air traffic control infrastructure. Duffy had requested $30.1 billion from Congress to upgrade the system and repeated his demand following the restoration of flight operations.
Nearly 6,000 flights cancelled across the US
The shutdown caused widespread disruption at major airports, with FlightAware reporting nearly 6,000 flight cancellations.
Passengers faced long waiting times as airlines struggled to restore normal operations. Departure boards continued to display scheduled flights even as some travellers received cancellation notifications or were told to leave aircraft.
At New York’s LaGuardia Airport, passengers reported repeated changes to departure times, with some flights pushed back several hours.
In Las Vegas, stranded travellers formed long queues at rental car counters as they considered driving to their destinations.
The disruption also affected passengers travelling on international routes, adding to the pressure on airlines and airport operations.
What should passengers do now?
Although the FAA lifted the nationwide groundstop, the return to normal operations was expected to take time because of the large number of delayed and cancelled flights.
Passengers scheduled to travel were advised to:
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Check their flight status directly with their airline before leaving for the airport.
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Monitor airline websites and mobile applications for updated departure times.
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Contact their airline if their flight has been cancelled or significantly delayed.
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Check rebooking and refund options before making alternative travel arrangements.
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Keep boarding passes and travel documents readily available.
Passengers with connecting flights should also confirm their revised schedules to avoid missing onward journeys.
US flight shutdown raises concerns over outdated aviation system
The incident has renewed concerns about the reliability of US aviation infrastructure, particularly as the country prepares for the busy Thanksgiving travel period.
A nationwide flight groundstop is extremely rare. A similar disruption occurred in January 2023 after a failure in the pilot notification system, while the only other nationwide grounding followed the September 11, 2001 attacks.
The latest outage has highlighted the risks associated with ageing air traffic control technology and increased pressure on the government to accelerate modernisation efforts.
