A Cut Backup Fiber Halted Northeast Flights Before UN Week

An FAA outage halted arrivals at five Northeast airports on September 21 after a backup fiber was cut in New Jersey. Ground stops spread from the Philadelphia Terminal Radar Approach Control to Newark Liberty, Teterboro, Kennedy, LaGuardia and, by spillover, Boston Logan.

Telecom lines were repaired by evening, and operations resumed. The failover had been sitting beside an active rail job, and controllers only learned it was dead when the primary circuit failed.

The Backup Was Already Cut When the Circuit Failed

Around 9:45 a.m. Eastern on September 21, 2026, a crew on NJ Transit’s Delco Lead project between New Brunswick and North Brunswick severed a Verizon fiber-optic cable about 10 feet from the utility markings on the site. NJ Transit said it later learned that cable was the backup to a primary circuit at Philadelphia TRACON, the radar and radio facility that sequences arrivals and departures across that slice of Northeast airspace.

The primary circuit failed Monday morning. FAA Administrator Bryan Bedford told reporters the agency did not know about the fiber break until after that circuit went down. When the system tried to fail over, the backup path was already gone. Bedford said about 600 feet of fiber had been taken out and that a full splice would take about 13 hours, so crews moved to install a replacement circuit instead.

He called the failed circuit an older Verizon line already slated for replacement under the air traffic overhaul. Verizon said its facilities had been working until contractors dug up and cut the cable, which runs adjacent to an Amtrak rail line in New Jersey.

MONDAY AT PHILADELPHIA TRACON

1. September 21, 9:45 a.m.: An NJ Transit Delco Lead crew severs a Verizon backup fiber between New Brunswick and North Brunswick, about 10 feet from utility marks.
2. Monday morning: The primary circuit at Philadelphia TRACON fails, and the failover finds the backup already dead.
3. About 10 a.m.: The FAA issues ground stops for Philadelphia International, Teterboro and Newark Liberty.
4. About 1 p.m.: Kennedy and LaGuardia join the stops as the corridor backs up.
5. Shortly after 5 p.m.: Transportation Secretary Sean Duffy says the telecom lines are repaired and Northeast operations are resuming.

In audio from the period, a controller at Philadelphia International tells a pilot, “Yeah, man, nothing works,” then adds that people are getting out, but it is slow going.

Amtrak, NJ Transit and the 10-Foot Miss

Duffy first blamed an Amtrak construction crew for cutting the fiber. Amtrak said the work happened on NJ Transit property and involved an NJ Transit contractor. NJ Transit confirmed a Delco Lead crew made the cut and opened a narrower question: who painted the marks the crew missed by 10 feet.

WHO SAID WHAT ABOUT THE CUT

• Sean Duffy: An Amtrak construction crew accidentally cut into a fiber line in New Jersey and forced the FAA to pause Northeast flights.
• Amtrak: The incident occurred on NJ Transit property and involved an NJ Transit contractor.
• NJ Transit: A Delco Lead crew severed the cable at about 9:45 a.m. while working about 10 feet from utility markings, and staff are determining whether Verizon or the contractor made those marks.
• Verizon: Construction contractors dug up and cut its cable beside an Amtrak rail line; the company said its cables were properly placed and that contractors are responsible for calling in the correct markings.

NJ Transit also said 36 of the 56 severed fiber cables had been spliced and should come back online shortly, with the rest to be finished and tested. That repair scoreboard sat beside a simpler design fact. A backup that shares the same rail corridor as live construction is one missed mark away from a regional halt, and on Monday nobody knew the spare path was already dark.

Duffy used the same post to say LaGuardia and Philadelphia were moving again while Newark, Kennedy and Teterboro stayed paused, then later said all Northeast operations were resuming.

UPDATE: An Amtrak construction crew accidentally cut into a fiber line in New Jersey which caused a telecom outage and forced FAA to pause flights in the Northeast.

Right now:
– Flights are resuming at LGA and PHL
– Flights into EWR, JFK, and Teterboro Airport are paused

This… https://t.co/3CDnTioMv0

— Secretary Sean Duffy (@SecDuffy) September 21, 2026

Newark Went Without a Landing From 9:38 a.m. to 5:22 p.m.

FlightAware recorded more than 1,000 flights canceled nationwide on Monday and more than 5,600 delayed. Newark took the worst of it. Flightradar24 recorded no commercial landings there from 9:38 a.m. to 5:22 p.m., a gap of 7 hours and 44 minutes at a United Airlines hub.

HOW THE STOPS LANDED

Flightradar24 counted 107 diversions away from Newark to 34 airports, touching 25 airlines. United accounted for 70 of those diversions. Washington Dulles took 19 and Kennedy took 12. Duffy said it would take time to clear the leftover delays and told travelers to check with their airlines.

Mark Carney Missed His UN Summit

The stops landed as about 130 world leaders and dozens of ministers headed to New York for the United Nations General Assembly high-level meeting, which opened Tuesday, September 22. Canadian Prime Minister Mark Carney’s arrival was delayed by the system failure, his office said, and he missed a previously scheduled summit.

Three New York-area airports going dark on the same Monday turns a fiber splice in Middlesex County into a diplomatic scheduling problem. Delegations, security details and press pools run on tight inbound banks. When Philadelphia TRACON cannot talk to airplanes, those banks do not slide by an hour. They pile up in Pittsburgh, Detroit, Dulles and Kennedy, then try to thread back into a field that has already lost a day’s worth of gates and crews.

United, which uses Newark as a major hub, said later Monday it had stopped canceling remaining domestic flights there. The leftover mess was aircraft and crews in the wrong cities, not a still-dead radio.

Philadelphia TRACON Lost Radar in 2025 Too

The same facility has a recent record. On April 28, 2025, controllers in Philadelphia TRACON Area C, which guides Newark traffic, lost radios for about 30 seconds and radar scopes for about 90 seconds. The FAA later described a 90-second radar and radio outage around 3:55 a.m. on May 9, 2025, at the same area. A further telecom issue on May 11 brought a Newark-bound ground stop of about 45 minutes.

Those failures followed the move of Newark approach work from Long Island to Philadelphia the previous summer. Officials had said upgrades at the new home would blunt outages. On May 28, 2025, Duffy stood up a new fiber-optic cable between Philadelphia and New York and called it the troubled portion of the line. He said the FAA was making connections and testing, and that he hoped the line would be in use by the start of July 2025.

Monday’s outage was not another 90-second blank scope. It was hours of ground stops because the spare path sat in a trench a rail contractor could reach. Putting new glass in the ground does not help if the spare and the construction job share the same corridor, and if no alarm fires when that spare goes dark.

Bedford Told Congress the Copper Swap Was 64 Percent Done

Six days before the cut, on September 15, Bedford testified on the FAA’s fiscal 2027 request. He said that with a $12.5 billion investment through the Working Families Tax Cuts Act, the agency had, as of September 1, replaced over 64 percent of copper telecom in its Time-Division Multiplexing network.

WHAT BEDFORD REPORTED AS OF SEPTEMBER 1

• Copper telecom: Over 64 percent of the TDM network replaced with modern equipment.
• Towers: 21 shifted from paper flight strips to electronic displays.
• Field gear: 101 surface awareness systems installed, more than 403 radio sites converted, and 6 surface-movement radars put in at 5 airports.

He told the subcommittee the FAA still needs a new network, named in the testimony as FAA Enterprise Network Services, to replace what he called a 1980s architecture that ties together airports, weather, radar, voice and aircraft. On Monday he made the same point in plainer words, while standing at an event that was supposed to show off new tools.

We’re pulling copper up and putting fiber down, but it’s the same data architecture that we’ve had for 50 years. The FAA wants to replace that architecture with a new modern federal enterprise network system, and we need budget for that.

Bryan Bedford, FAA administrator, to reporters on September 21, 2026

Duffy said the issues are not new, not shocking, and belong to an old system the agency has been stuck with. He again asked for more money to modernize. The Department of Transportation has already described that $12.5 billion as an initial sum going into radar, software, hardware and telecom at more than 4,600 sites nationwide.

The New Fiber Still Shares One Rail Corridor

True failover needs a second physical path, not a second cable in the same trench. Monday’s sequence was a primary circuit dying and a backup that had already been cut beside a rail project, with the agency learning about the cut only after the failover failed. That is a monitoring gap as much as a contractor gap.

NJ Transit said it was still determining whether Verizon or the contractor painted the marks the crew missed by 10 feet. Verizon’s cable still runs beside the Amtrak line. That is the path the backup was on when the primary circuit died.