Travelers across the U.S. Northeast experienced widespread flight disruptions, cancellations, and ground stops on Monday following a critical equipment failure at a key regional air traffic control center operated by the Federal Aviation Administration in Philadelphia. The outage halted operations at every major airport in the New York City area for several hours, bringing commercial air traffic to a near-standstill at Newark Liberty International Airport, where no commercial flights landed from about 9:40 a.m. to just after 5:20 p.m. local time, according to flight-tracking data from Flightradar24.
Major Northeast Flight Disruptions Caused by FAA Technical Failure
While commercial operations ground to a halt, President Trump’s flight from Washington to New York was able to depart as scheduled.
Primary Circuit Failure and Severed Backup Line
Regional air traffic control facilities utilize two separate lines to carry radar and communications data in and out: a primary connection and a backup. According to federal officials, a circuit on the primary line failed on Monday morning. When the system attempted to switch over automatically, workers discovered that the backup fiber optic line had also been severed.
Conflicting accounts emerged regarding the cause of the severed backup fiber. Transportation Secretary Sean Duffy stated that an Amtrak construction crew was to blame. However, the rail organization pointed instead to a New Jersey Transit construction crew working in the area between Newark and New Brunswick, New Jersey.
FAA Administrator Bryan Bedford told reporters that the agency focused immediately on restoring the primary connection by installing a new circuit while simultaneously working to repair the damaged backup line. Describing the extent of the damage, Bedford stated, That fiber break is probably 13 hours to repair.
Verizon technicians also mobilized to assist in restoring service.
Impact Across Northeast Airports and Beyond
The outage severely affected flights at Newark, Philadelphia International Airport, John F. Kennedy International Airport, and LaGuardia Airport. More than 600 flights into and out of Newark were canceled, and over 200 flights were canceled at Philadelphia. Nationwide flight-tracking reports indicated nearly 4,000 total U.S. flight delays and 500 cancellations by Monday afternoon.
Regional facilities outside the immediate New York and Philadelphia areas also felt the impact. Zach Sundquist, assistant airport director at the Portland International Jetport, reported multiple delays and cancellations affecting arrivals and departures connected to Newark, New York, and Philadelphia. Meanwhile, Bangor International Airport avoided disruptions only because its runway was already closed for scheduled repairs.
The same Philadelphia facility experienced previous disruptions that impacted Newark Liberty International Airport in the spring of 2025. Federal officials noted that the primary circuit that failed on Monday is already scheduled for replacement as part of a massive overhaul of the nation’s air traffic control system.
Airlines Respond and Operations Resume
By Monday evening, Transportation Secretary Sean Duffy announced that the damaged communications lines had been repaired, allowing airports across the Northeast to resume operations. Despite the resumption of flights, officials cautioned that clearing existing delays would take time as disrupted aircraft and flight crews worked their way back into position.
Airlines operating in the region, including United Airlines, issued travel waivers to give affected customers additional flexibility. United reported that flights destined for Newark were either held at their departure points or diverted to alternative airports. Passengers stranded by the cancellations were advised by the FAA to check flight statuses with their respective carriers before heading to terminals.
Separately on Monday, the FAA initiated testing on a new artificial intelligence-based computer system designed to help air traffic controllers predict schedule conflicts and weather issues. However, because that new technology is initially being tested exclusively in the Washington, D.C., area, officials confirmed it was unrelated to the Northeast technical outages.