An intervention that, according to the official version, was routine turned into a shutdown with nationwide consequences for air traffic in the United States. The fault in the telecommunications system of the Federal Aviation Administration left behind more than 12,000 canceled flights, cascading delays and thousands of passengers stranded at the country’s main airports.
The fault that paralyzed air traffic for hours
According to US authorities, the problem occurred during work to replace old copper telecommunications lines with fiber optics at a remote FAA facility. The disruption led to the suspension of flights for about four hours on Friday.
US Transportation Secretary Sean Duffy said it is being investigated whether this was human error or the installation of a defective device. He described the incident as a problem that arose during a maintenance intervention that had been expected to be routine.
More than 12,000 cancellations and airports hit across the country
After the airspace reopened, the domino effect did not stop. According to data from the FlightAware platform, by Saturday morning more than 4,000 flights to, from or within the US had been canceled, while more than 8,000 others had been recorded a day earlier, bringing the total to more than 12,000.
The problems affected some of the most important hubs in American air traffic, including the airports of Boston, Washington, New York and Miami. For passengers, the formal restoration of the systems does not automatically translate into an immediate return to normality.
Admission of aging infrastructure as responsibility remains unclear
Duffy himself acknowledged that the American air traffic control system still relies on outdated technology. According to him, this was also the reason why work had begun to modernize cables and telecommunications.
FAA Administrator Brian Bedford apologized for the chaos and said the worst part of the crisis had passed. Based on the preliminary investigation, he ruled out the possibility of a cyberattack or an incident linked to artificial intelligence, while attention remains on the technical component that caused the fault.
Airlines and contractor under pressure
L3Harris, the company contracted to upgrade air traffic control equipment, said it is cooperating with US authorities. According to the company, more than 70% of the process of switching from copper lines to fiber optics has been completed.
Meanwhile, airlines warned that the full restoration of schedules will take time, as aircraft and crews have been left scattered in locations different from the original planning. American Airlines and Delta Air Lines signaled that cancellations and itinerary changes will continue.
The crisis moves from airports into politics
The disruption also had consequences beyond aviation, affecting sports activities and the movement of teams over the weekend. Some matches were postponed because it was impossible to travel as planned.
On the political front, New York Governor Kathy Hochul called for Sean Duffy’s resignation and urged Congress to launch a full investigation. At the same time, the Trump administration is seeking an additional $50 billion in funding to modernize the system, turning the crisis into a direct debate over management, responsibility and the real condition of US infrastructure.
The latest suspension is considered the longest total grounding of flights in the US in the past 25 years and the third of its kind during the 21st century.
The fact that a maintenance intervention managed to affect 17 of the 22 regional air traffic control centers has reopened serious questions about the resilience of a system that, according to US officials, is being modernized but remains dependent on old and fragile links.