On 21 September, workers accidentally cut a telecommunications line in New Jersey used by the Federal Aviation Administration (FAA). This triggered communications failures that forced authorities to halt incoming flights at major airports including Newark, John F Kennedy International Airport, LaGuardia, and Philadelphia.
The disruption lasted for much of the day, impacting one of the busiest aviation corridors in the world. According to tracking website FlightAware, approximately 7,000 flights were delayed or cancelled, and more than 100 aircraft were diverted.
According to Sean Duffy, US Transportation Secretary, telecommunications lines were restored later that day. However, the operational impact continued after the cable was repaired as airlines worked to reposition aircraft and crews, and resolve delays.
While fibre cuts are not uncommon, the scale of disruption highlights how an incident can ripple across highly interconnected systems. A localised infrastructure issue quickly became a nationwide aviation problem, demonstrating how critical services rely on resilient communications networks.
For digital infrastructure leaders, the incident serves as another reminder that reliability goes beyond network performance. Reliability also means critical services can continue operating when unexpected failures occur.
The ‘if it ain’t broke’ fallacy
The airline disruption has kickstarted debate about the state of US digital infrastructure, particularly the aviation sector’s dependence on legacy technology.
The incident highlighted the fragility of the ageing US air traffic control system – despite ongoing modernisation efforts supported by billions of dollars in federal funding. Although upgrades are in progress, many operational systems still depend on infrastructure that has accumulated layers of technology over decades.
Aviation isn’t the only sector experiencing this issue. Across transport, utilities, government, and communications networks, organisations still rely on legacy systems that were not designed for the demands of today’s digital economy.
Because older equipment usually functions for years beyond its intended lifecycle, companies and institutions can become complacent about the risks it introduces. However, as systems age, they become less efficient and less resilient to modern operational threats.
The result is an infrastructure landscape where reliability increasingly depends on assets that have become difficult to maintain or integrate with updated technologies.
Cascading out of control
The fibre cut also demonstrates another risk to digital infrastructure operators: cascading failure.
A May report from the United Nations Office for Disaster Risk Reduction (UNDRR), the International Telecommunication Union (ITU) and Sciences Po warned that societies have become heavily dependent on interconnected digital systems without adequately preparing for large-scale disruptions.
Kamal Kishore, special representative of the United Nations secretary-general for disaster risk reduction, and head of UNDRR, explained: “As our societies become more reliant on digital technologies, disruptions caused by disasters can cascade across systems and borders, triggering far‑reaching and potentially catastrophic failures.”
The report highlights telecommunications outages, submarine cable failures and other communications incidents as potential triggers for widespread economic and social disruption.
“We must plan, build and maintain digital infrastructure with systemic risk in mind – now and for the future. Digital infrastructure must be resilient infrastructure,” Kishore concluded.
Today’s digital networks support almost every critical service, such as transportation systems (including airlines), financial processes, and emergency services coordination. When a single component in the connectivity pipeline fails, disruptions can spread rapidly across sectors.
While last week’s fibre cut primarily impacted the aviation sector, other such incidents can easily cascade into a larger issue that disrupts vital services.
Investing in the infrastructure
The incident hasn’t raised the question of whether outages can be prevented entirely – that would almost definitely be a fool’s errand. The primary focus of it is on how operators can reduce the consequences when failures do inevitably happen.
The UNDRR’s report argues that resilience must become a central design principle for critical infrastructure. It recommends stronger contingency planning, improved coordination between sectors, greater mapping of infrastructure dependencies, and investment in backup systems able to maintain operations during outages.
Despite this, the report’s authors caution against allowing analogue skills and offline alternatives to disappear completely. To so would mean having no fallback if digital systems entirely collapsed.
Furthermore, putting the time and investment into replacing ageing equipment before it reaches the end of its useful life can significantly reduce risk while improving overall reliability.
For telecom operators, that means investing in more than additional capacity. Other priorities should include route diversity, redundant communications paths, automated failover mechanisms and stronger physical protection of fibre infrastructure. This is especially important as AI continues to scale up and put demand on existing infrastructure.
The New Jersey outage may be remembered as a relatively short-lived disruption. But its significance extends beyond a single day of chaos and delayed flights. A damaged fibre cable temporarily disrupted one of the world’s busiest aviation regions – publicly demonstrating how vulnerable it is to failures in the communications networks.
As digital dependency continues to grow, preserving and modernising legacy telecoms infrastructure has gone beyond a maintenance issue. We’ve now seen how important it is as a matter of national resilience – even to an advanced economy.
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