# US East Coast aviation disruption > Live situation record from CLSTR: https://clstr.news/situations/20260921-us-east-coast-aviation-disruption > Updated: 2026-09-21T18:24:22.000Z. Sources: 153. Developments: 2. Widespread aviation disruptions occurred across the U.S. East Coast following a failure in the air traffic control communication system. The incident was triggered when a primary circuit at the Philadelphia TRACON facility failed, and officials discovered that a backup fiber-optic cable in New Jersey had been accidentally severed by an Amtrak contractor during construction work. The Federal Aviation Administration (FAA) implemented ground stops and flight restrictions at several major airports, including JFK, LaGuardia, Newark Liberty, Teterboro, Philadelphia, and Boston Logan. The outage resulted in thousands of delays and cancellations nationwide. At Newark Liberty and Philadelphia International, flight operations were significantly impacted, with Newark experiencing average delays of 112 minutes. The disruption coincided with the arrival of world leaders for the 81st United Nations General Assembly in New York. Among those affected was Bulgarian President Iliana Iotova, whose flight was diverted to Boston. U.S. Secretary of Transportation Sean Duffy noted that the event underscores the necessity for increased funding to modernize aging air traffic control infrastructure. While many operations began to resume by Monday evening, significant backlogs and delays persisted. Repairing the damaged fiber-optic line was estimated to take approximately 13 hours. ## Claims - More than 5,600 flights across the United States were delayed or cancelled due to the outage. (disputed by 4 sources) - Approximately 7,000 flights were delayed or canceled across the United States. (disputed by 4 sources) - Flights at Newark experienced average delays of 112 minutes. (disputed by 2 sources) - Average flight delays at Newark Liberty International Airport reached approximately 170 minutes. (disputed by 2 sources) - The FAA issued ground stops for Philadelphia International, Newark Liberty International, and Teterboro airports. (corroborated by 20 sources) - The disruption is caused by an equipment outage involving radio frequencies at the Philadelphia TRACON facility. (corroborated by 20 sources) - Construction contractors cut a Verizon fiber-optic cable, contributing to the outage. (corroborated by 17 sources) - The Philadelphia TRACON facility lost its primary communications circuit. (corroborated by 13 sources) - The backup fiber-optic cable was found to be broken when the system attempted to switch over. (corroborated by 12 sources) - Repairing the severed backup fiber-optic cable is estimated to take approximately 13 hours. (corroborated by 11 sources) ## Timeline ### 2026-09-21: East Coast aviation disruption strands Bulgarian President in Boston A severed fiber optic cable in New Jersey caused major flight delays across the U.S. East Coast, diverting Bulgarian President Iliana Iotova and affecting hundreds of flights during the UN General Assembly. 9 sources. https://clstr.news/cluster/president-iliana-jotova-stranded-in-boston-due-to-us-flight-disruptions ### 2026-09-21: US Northeast air travel disrupted by fiber optic cable cut and equipment failure A fiber-optic cable cut by an Amtrak construction crew and a circuit failure in Philadelphia caused massive flight delays and cancellations across the U.S. Northeast, affecting major airports like JFK and LaGuo 144 sources. https://clstr.news/cluster/faa-ground-stops-at-newark-philadelphia-and-teterboro-airports --- Cite as: US East Coast aviation disruption. CLSTR, https://clstr.news/situations/20260921-us-east-coast-aviation-disruption