Residual Delays Persist at Northeast Airports After Fiber Cut

Key points

• As of Tuesday morning, Newark Airport reported 58 cancellations and 53 delays, while JFK had 7 cancellations and 46 delays, and LaGuardia had 4 cancellations and 16 delays.
• NJ Transit confirmed its crew severed a backup fiber-optic cable during the Delco Lead project between New Brunswick and North Brunswick, operating 10 feet from utility markings.
• Transportation Secretary Sean Duffy initially blamed an Amtrak crew, but Amtrak and NJ Transit clarified that NJ Transit was responsible for the construction work.
• The FAA had to pause flights after the primary circuit failed and the backup line was cut, leaving controllers without radar or communications for hours.
• More than half of the 56 affected fiber cables had been tested and were coming back online by Tuesday morning, according to NJ Transit.

Background

This incident follows a series of disruptions at the same Philadelphia FAA facility in spring 2026. The primary circuit failure is part of a broader issue with aging infrastructure, which Duffy cited as needing modernization. The backup cable cut compounded the primary failure, leading to widespread ground stops.

How outlets are covering it

Gothamist and 6abc Philadelphia reported that Transportation Secretary Sean Duffy initially blamed an Amtrak construction crew for the cable cut. However, NJ Transit and Amtrak clarified that NJ Transit's crew was responsible for the work on the Delco Lead project. NBC10 Philadelphia emphasized the impact on Philadelphia International Airport, noting that flights resumed after the repair but delays persisted. All sources agreed that the primary circuit failure and the backup cable cut were the root causes of the FAA ground stops.

Why it matters

The incident highlights vulnerabilities in the nation's air traffic control infrastructure, particularly the reliance on backup systems that can be compromised by construction activities. The prolonged delays affected thousands of travelers and underscored the need for modernizing aging telecom infrastructure to prevent similar disruptions.

What to watch

NJ Transit is investigating whether Verizon or another contractor mis-marked the utilities, leading to the cable cut. The FAA is expected to continue monitoring the situation as delays clear. The primary circuit is due to be replaced as part of a massive overhaul of the air traffic control system.