US Air Traffic Grounded for Four Hours After Aging Systems Fail

Key points

• The FAA grounded all US flights at 3:36 p.m. Eastern Time on November 13, 2026, citing instability in radar and communications systems across Air Route Traffic Control Centers.
• Transportation Secretary Sean Duffy stated that old legacy equipment, including routers and copper lines, became overloaded with data, causing the outage. He requested $50 billion from Congress to modernize the system.
• Homeland Security Secretary Markwayne Mullin confirmed there was zero evidence of a cyberattack or security threat, noting the incident was unrelated to a recent Microsoft outage.
• The ground stop was lifted at 8:15 p.m. Eastern Time, but airlines reported significant delays. Over 6,600 flights were canceled by 9:30 p.m., with an additional 1,500 Saturday flights canceled.
• Congressional leaders from both parties called for investigations and increased funding, with Republicans emphasizing the need to modernize infrastructure and Democrats demanding accountability for the failure.

Background

This is the first nationwide ground stop since January 2023, when a pilot notification system failed. The previous national halt occurred after the September 11, 2001, attacks. The FAA has long faced criticism for aging infrastructure, with Congress approving $12.5 billion for upgrades last year, but officials argue more funding is needed to replace outdated analog systems.

How outlets are covering it

The administration, led by Transportation Secretary Sean Duffy and Homeland Security Secretary Markwayne Mullin, blamed the outage on 'incredibly old' air traffic control systems and legacy equipment that could not handle data loads. They emphasized that the issue was not a cyberattack and that safety was the priority. In contrast, congressional Democrats, including Senator Jacky Rosen and Representative Maxwell Frost, called the stop 'unacceptable' and demanded an investigation into the cause. Republicans, such as Representative Nick Langworthy, focused on the need for modernization, arguing that the cost of failure outweighs the expense of upgrades. While the FAA stated systems were 'thoroughly tested' before reopening, passengers and some officials expressed frustration over the lack of clear communication and the potential for future disruptions.

Why it matters

The incident highlights the vulnerability of the US air traffic control system, which relies on aging infrastructure. The disruption affected millions of travelers, canceled thousands of flights, and disrupted sports schedules and holiday travel plans. It underscores the urgent need for infrastructure modernization to prevent similar nationwide outages, which could have severe economic and safety implications.

What to watch

Airlines are working to clear backlogs, with Delta and United resuming some flights, but delays are expected to persist for days. The FAA aims to restore full capacity before the Thanksgiving travel peak. Congress is expected to debate the $50 billion funding request for air traffic control modernization, while investigations into the specific causes of the outage may continue.