Nearly five-hour shutdown disrupts thousands of flights as Washington investigates contractor responsibility, ageing infrastructure and inadequate network redundancy.
US authorities are investigating whether a router installed by defence contractor L3Harris triggered a nationwide aviation shutdown on Friday, November 13, halting aircraft departures for nearly five hours and causing thousands of cancellations and delays in the country’s worst nationwide ground stop since the September 11, 2001 attacks.
Transportation Secretary Sean Duffy said the failure occurred while L3Harris was replacing an ageing copper telecommunications connection with fibre-optic infrastructure at a remote Federal Aviation Administration (FAA) facility. A router began flooding other devices with more than 1,000 connection attempts every four to five seconds, disrupting aircraft communications and radar-data feeds across 17 of the FAA’s 22 en-route air traffic control centres.
The FAA imposed the nationwide ground stop as a safety precaution, although control centres did not lose all functionality. Engineers restored network stability after isolating the affected equipment. Airlines subsequently faced widespread scheduling disruptions as they repositioned aircraft and crews. Reuters reported more than 20,000 flights affected by cancellations or delays following the shutdown.
Duffy said investigators had yet to determine whether the incident resulted from an installation or configuration error, defective equipment or wider shortcomings in the ageing FAA network. Officials found no evidence of a cyberattack or artificial intelligence involvement. As a precaution, the FAA disabled the problematic function on approximately 60 similar routers pending further testing.
L3Harris said it was cooperating with the investigation and had completed more than 70% of the planned conversion from copper to fibre-optic communications alongside the FAA and telecommunications partners. The company acknowledged the disruption’s seriousness but did not accept responsibility for the failure.
The incident exposed a deeper structural vulnerability. L3Harris owns the existing telecommunications network on which the FAA remains dependent until a replacement becomes operational. Officials distinguished Friday’s routine maintenance from the separate national air traffic control modernisation programme, for which Congress has already allocated $12.5bn.
Duffy is seeking a further $50bn in emergency funding for broader aviation infrastructure improvements. The FAA spends approximately $1bn annually maintaining its ageing telecommunications system, including equipment dating back about 25 years. The additional funding has not yet been approved.
Beyond determining L3Harris’s responsibility, the investigation raises a more consequential question: why could routine maintenance at a remote facility destabilise communications across most of America’s en-route control centres?
The shutdown underscores a critical weakness in infrastructure modernisation: upgrading technology without sufficient fault isolation and independently functioning backup systems can turn a local equipment failure into a national operational crisis.
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