Cut Fibre Cable Halts Flights at Five Northeast Airports

The Federal Aviation Administration halted flights at five airports in the Northeast on Monday 21 September after a fibre-optic cable was cut at a construction site in New Jersey. The ground stops hit Newark, Philadelphia, New York JFK, LaGuardia and Teterboro, and came as about 130 world leaders arrived in New York for the United Nations General Assembly.

What happened

According to FAA Administrator Bryan Bedford, the Philadelphia terminal radar approach control (TRACON) lost its primary communications circuit and switched to a backup. The backup was then found to be cut as well. The backup fibre had been severed that morning by a construction crew working alongside a rail line in New Jersey.

Bedford said a new circuit would be operational imminently, though it was unclear at first when the ground stops could be lifted. Flightradar24 data showed no commercial flight landing at Newark between roughly 09:40 and just after 17:20 local time.

Who cut the cable

Responsibility is disputed. Transportation Secretary Sean Duffy said an Amtrak construction crew had cut the line. Amtrak rejected that, saying the incident “occurred on New Jersey Transit property and involved a New Jersey Transit contractor.”

By the evening Duffy announced that the telecommunications lines had been repaired and that operations across the Northeast were resuming, while warning that clearing the delays would take time.

Delays

As of 6:40 p.m. Eastern, the FAA’s data showed average delays of 306 minutes at Newark, 212 minutes at Philadelphia, 159 minutes at Teterboro, 72 minutes at JFK and 67 minutes at LaGuardia. More than 600 flights were delayed at Newark and Philadelphia, over 20 percent of operations at the two airports, and several flights were diverted to other airfields. Newark is a major United Airlines hub and Philadelphia is an American Airlines hub.

The infrastructure argument

The outage landed in the middle of a campaign to modernise the US air traffic system. Congress approved $12.5 billion in 2025 for that purpose, and Duffy said afterwards that the incident underscored the need for further infrastructure funding. Two days later he told the Aero Club of Washington that the system needs another $30 billion for new air traffic control equipment and airports.

The episode also shows how a single physical point of failure can ripple across several facilities. A redundant circuit only helps if it survives when the primary fails, and here the backup was the line that was cut.

Aviation International News described the event as a construction accident that crippled Northeast air traffic, a reminder that, for controllers, communications links matter as much as radars and automation.

The ground stops ended the same day, but the disruption illustrated how quickly one fault can spread through the busiest airspace in the country. Ground stops at five airports forced airlines to cancel, hold or divert flights, and the knock-on effect of such an eight-hour gap at a hub like Newark typically takes much of the following day to clear.