FAA halts all U.S. flights as new AI traffic tool sparks debate over system reliability

Key points

• The FAA ordered a nationwide ground stop at 4:16 p.m. ET on Nov. 13, 2026, the third such event in U.S. history.
• The halt was attributed to a telecommunications outage affecting Air Route Traffic Control Centers, not a security threat.
• The FAA rolled out its new AI system, SMART, to 22 centers on Nov. 10, three days before the outage.
• SMART is an $875 million tool designed to predict traffic flows and optimize routes, having rerouted 180 flights in its initial phase.
• Officials and the developer, Air Space Intelligence, deny any connection between SMART and the ground stop.
• Critics and aviation analysts argue the timing is a significant coincidence, raising concerns about integrating new AI with legacy systems.

Background

The FAA has been undergoing a multibillion-dollar modernization of its air traffic control systems, particularly after a deadly midair collision near Washington, D.C., in January 2025. The SMART system was first tested in Washington, D.C., airspace in September 2026. The agency has also been working to eliminate reliance on 55-year-old floppy disk formats by 2028.

How outlets are covering it

Mashable and Gizmodo report that the FAA and Air Space Intelligence deny any link between SMART and the ground stop, noting that SMART had successfully rerouted flights prior to the outage. Conversely, CNN aviation analyst Mary Schiavo and Democrats in the House express strong skepticism. Schiavo calls the timing 'too much of a coincidence,' noting that SMART was designed to manage en-route traffic just as a communications outage occurred. House Democrats have requested a GAO review, citing concerns that the National Air Traffic Controllers Association was excluded from SMART's design and that the AI could 'hallucinate' safety-critical information. Ars Technica highlights that while the FAA claims human controllers retain final decision-making power, the rapid rollout has outpaced its own 90-day test period.

Why it matters

The incident highlights the risks of integrating advanced AI into critical infrastructure like air traffic control. A nationwide ground stop is a rare and disruptive event, and the timing with the SMART rollout has intensified public and political scrutiny over the safety and reliability of the FAA's modernization efforts.

What to watch

The FAA is investigating the cause of the telecommunications outage. No timeline for the resumption of normal operations has been provided. The GAO may review the FAA's SMART implementation strategy following a request from House Democrats.