US aviation system faces massive disruptions following nationwide ground stop

A nationwide ground stop caused by a router issue has disrupted more than 20,000 flights across the United States since Friday, November 14, 2026. The Federal Aviation Administration issued the ground stop on November 13, 2026, and the disruption lasted nearly five hours. The incident occurred while contractor L3Harris was performing routine maintenance to switch from copper to fiber-optic lines.

Communication instability and flight disruptions

The technical failure caused significant instability in communications, affecting 17 of the 22 en route centers managed by the Federal Aviation Administration. The router issue triggered over 1,000 connection attempts every four to five seconds, which overloaded the communications system. While the Federal Aviation Administration stated that data became unstable, officials noted that no facilities went dark and communications did not fully go down.

The scale of the disruption is substantial. As of 6:45 pm ET on November 14, 2026, more than 6,150 US flights were cancelled and over 7,300 were delayed. On Friday, November 14, 2026, 9,200 flights were cancelled and 7,500 flights were delayed. The impact extends into the weekend, with 530 flights scheduled for Sunday, November 15, 2026, already cancelled.

Aging infrastructure and maintenance issues

The disruption is linked to the replacement of an aging telecommunications system. The Federal Aviation Administration is currently replacing a legacy copper wire system with a modern fiber-optic system. The Federal Aviation Administration spends $1 billion annually to maintain the legacy copper wire system. The routers involved in the incident are approximately 25 years old and were originally scheduled for replacement in 2006.

L3Harris has completed over 70% of the planned conversion from the legacy copper wires to the fiber-optic system. Potential issues with the routers were identified in Arkansas and Texas. The White House convened an emergency meeting in the Situation Room on Friday, November 14, 2026, to investigate the disruption.

Official investigations and recovery efforts

US Transportation Secretary Sean Duffy said the Federal Aviation Administration system failed to meet the moment. Sean Duffy added that officials are investigating if the fault was user error, installer error, or a faulty router. The White House convened the emergency meeting to investigate if the problem was a cyberattack.

Bryan Bedford, the Head of the Federal Aviation Administration, said the system remains stable. Bryan Bedford also stated that airline operations are expected to return to normal by late Sunday. This incident follows a previous nationwide ground stop in January 2023 that lasted 90 minutes and affected 11,000 flights due to an external contractor deleting files.

Glossary

• Federal Aviation Administration — The Federal Aviation Administration is the agency that manages en route centers. It is currently replacing a legacy copper wire system with a modern fiber-optic system.
• ground stop — A ground stop is an action issued by the FAA. It can be issued due to an equipment outage or a router issue.
• en route centers — En route centers are facilities managed by the Federal Aviation Administration. These centers are affected by communication instability.
• L3Harris — L3Harris is an American technology company, defense contractor, and information technology services provider. The company produces products for various sectors, including avionics and electronic systems.
• Situation Room — The Situation Room is a location where the White House convened an emergency meeting to investigate the disruption.