Severed fiber cable halts flights at five major Northeast airports

A severed fiber-optic cable in New Jersey on Monday, September 21, 2026, caused cascading failures in air traffic control infrastructure serving the Northeast's busiest airports. Around 9:45 a.m., the primary data circuit at the Philadelphia Terminal Radar Approach Control (TRACON) facility failed. When controllers attempted to switch to the backup system, they discovered it had also been cut, forcing the Federal Aviation Administration to issue ground stops at Newark Liberty International, Philadelphia International, LaGuardia, John F. Kennedy International, and Teterboro airports.

Responsibility for the severed cable remains disputed among multiple parties. Transportation Secretary Sean Duffy initially stated that an Amtrak construction crew was responsible. Amtrak subsequently denied involvement, stating the incident occurred on New Jersey Transit property and involved a New Jersey Transit contractor. Verizon said its cables were properly placed and contractors were responsible for calling for correct utility markings. New Jersey Transit acknowledged the cable cut and noted an investigation into incorrect utility markings at the site, indicating a contractor was working approximately 10 feet away from marked utility lines.

FAA Administrator Bryan Bedford stated that the fiber break would likely take approximately 13 hours to repair. By early afternoon, some flights resumed at LaGuardia and Philadelphia, with full operations resuming by Monday evening after telecom lines were repaired. Newark Liberty International Airport recorded more cancellations than any other airport globally that day, with over 300 flights canceled representing more than half of scheduled departures. Across the affected region, approximately 7,000 flight delays and cancellations occurred, including roughly 1,400 at New York City's three major airports. The outage disrupted travel for world leaders arriving for the United Nations General Assembly, though President Trump's flight from Washington departed as scheduled.

The incident highlighted vulnerabilities in aging air traffic control infrastructure. The Philadelphia TRACON facility had experienced similar disruptions in spring 2025. FAA officials noted the primary circuit was scheduled for replacement as part of a broader modernization effort. Transportation Secretary Duffy emphasized the incident underscores the need for infrastructure funding to modernize the nation's aging air traffic control system, stating the current data architecture has remained largely unchanged for 50 years. The FAA announced it was simultaneously testing a new AI-powered computer system to predict scheduling conflicts and weather issues, though initial testing was limited to the Washington, D.C., area.

The timing coincided with publication of a Government Accountability Office (GAO) report warning that air traffic control systems remain vulnerable to cyberattacks including spoofing, jamming, and interference. The report found the FAA lacks real-time threat detection systems and that some aircraft messaging systems predate modern cybersecurity standards. The GAO noted the FAA handles more than 44,000 flights daily and approximately 3 million passengers. Senator Ron Wyden characterized the FAA's failure to require secure communications as "a major threat to US national security, to our economy and the safety of the flying public." The report also noted instances abroad of satellite navigation interference attributed to Russia by Estonia and Finland, which Moscow denied.