Over 7,000 US Flights Disrupted After FAA Telecom Outage Halts Northeast Arrivals

More than 7,000 US flights were delayed or cancelled on Monday after a telecommunications failure at a Federal Aviation Administration (FAA) air traffic control facility in Philadelphia disrupted operations across the Northeast, forcing major airports to halt incoming flights for hours as world leaders arrived in New York for the United Nations General Assembly.

The disruption began around 9:45 am when the primary communications circuit at the Philadelphia Terminal Radar Approach Control facility failed. When controllers attempted to switch to the backup system, they discovered that a fibre-optic line in New Jersey had also been accidentally severed during construction. The failures left controllers without reliable radar and communications, prompting the FAA to impose ground stops and restrictions across the region.

According to FlightAware, about 7,000 flights were delayed or cancelled, including roughly 1,400 at the three major New York-area airports. More than 100 flights were diverted. Newark Liberty International Airport suffered the worst disruption, with more than 600 flights cancelled or affected, while more than 200 flights were cancelled at Philadelphia International Airport. Flights were also disrupted at JFK, LaGuardia, Boston Logan and Teterboro.

At Newark, commercial arrivals stopped at about 9:40 am and did not resume until shortly after 5:20 pm, leaving the major United Airlines hub close to a standstill for much of the day. LaGuardia and Philadelphia also experienced prolonged restrictions. Boston imposed a ground stop because of traffic spilling over from other airports, while Reagan Washington National Airport separately halted flights for more than an hour because of excessive traffic volume.

Transportation Secretary Sean Duffy later said the damaged telecommunications lines had been repaired and airports across the Northeast were returning to normal. However, he warned that it would take time to clear the backlog. The FAA advised passengers to check their flight status before travelling, while some airlines offered affected passengers fee-free changes.

The cause of the fibre cut also became disputed. Duffy initially blamed an Amtrak construction crew, but Amtrak denied responsibility. New Jersey Transit later said a crew working on its Delco Lead project between New Brunswick and North Brunswick had accidentally severed a fibre-optic cable while working near marked utilities. NJ Transit said it was investigating whether Verizon or the contractor had made the utility markings.

The outage coincided with the arrival of about 130 world leaders and dozens of ministers for the UN General Assembly in New York. It also renewed concerns about the ageing US air traffic control network. Congress approved $12.5 billion for system upgrades in 2025, while officials have continued pushing for further modernisation.

The same Philadelphia FAA facility experienced significant communications problems affecting Newark in 2025. Separately, the FAA has begun testing an AI-assisted system in Washington, DC, designed to help predict scheduling conflicts and weather-related problems. Officials said that system was unrelated to Monday's outage.