The Federal Aviation Administration halted every departing commercial flight in the United States on Friday afternoon, issuing a nationwide ground stop that stranded travelers at airports from coast to coast — and the timing has turned an infrastructure failure into a federal investigation over whether the agency's brand-new artificial intelligence system played a role.
The FAA ordered the ground stop at approximately 4 p.m. ET on November 13, citing "extraordinary circumstances" and "reasons of safety," according to the New York Post. Early alerts offered little detail, and the agency did not immediately connect the disruption to SMART, the AI-supported air traffic system it had expanded to all of its control centers just three days earlier. For continuing coverage of this story and other major AI developments, we are tracking the investigation as it unfolds.
What Happened on Friday
The disruption was sweeping. Departures were halted at every U.S. airport, an extraordinary step the country has not seen since January 2023, when a malfunction in the FAA's Notice to Air Missions (NOTAM) system grounded flights nationwide. By Friday evening, aviation industry counts cited across major outlets showed roughly 10,000 flights delayed and approximately 4,700 canceled, and airlines warned that recovery would stretch through the weekend as crews hit duty-hour limits and aircraft sat out of position.
The FAA ultimately blamed the stoppage on a telecommunications issue. Reporting from Reuters and The Washington Post described an air traffic communications outage, and subsequent reporting indicated the failure involved the radio frequency systems that pilots and controllers use to communicate. The ground stop advisory was initially listed through 11:30 p.m. ET, though officials cautioned that timestamp was not a guaranteed resumption time. The agency lifted the stop later Friday evening, but not before the incident had triggered questions at the highest levels of government.
The SMART System Went Live Days Earlier
The reason for the scrutiny is timing. On November 10 — three days before the ground stop — the FAA expanded SMART, short for Strategic Management of Airspace, Routes and Trajectories, to all 22 of its Air Route Traffic Control Centers, according to the Washington Times and the New York Post.
SMART was developed under an $875 million, 12-year contract awarded to Air Space Intelligence, a government contractor. The system merges roughly 200 live data streams — weather patterns, flight paths, traffic flow, controller staffing metrics and more — into a single platform designed to shift air traffic management from a reactive model to a predictive one. It generates routing and scheduling recommendations that FAA specialists in Washington review before forwarding them to the Air Traffic Control System Command Center in Warrenton, Virginia; leadership at each local facility then decides whether to accept or decline each suggestion.
Crucially, the FAA has been explicit that SMART is an advisory layer, not an autonomous one. The agency has stated the system cannot replace human controllers and cannot take over control of an aircraft. But the platform does sit at the intersection of an enormous volume of live operational data — and that intersection is exactly where investigators are now looking.
Investigators Won't Rule Out the AI
When a reporter asked Homeland Security Secretary Markwayne Mullin on Friday evening whether the FAA's new AI tool could have contributed to the communications failure, his answer was carefully non-committal.
"We're looking at that," Mullin said, referring directly to the SMART system. When the reporter used the term "AI," Mullin noted that the administration now officially calls the technology "Super Intelligence," or SI, under a September executive order — before adding: "You can't rule out anything at this point."
Mullin simultaneously sought to calm fears about the cause, telling reporters "it's just a telecommunications outage" and that there was no indication yet of a "nefarious attack," according to ABC News. He also saw no apparent connection between the ground stop and the separate Microsoft 365 outage that began a day earlier, according to GeekWire.
The company behind SMART moved quickly to distance its product from the disruption. "The current ground stop is not based on or a result of the SMART system, any product of ASI or our integration with FAA and ATC," Air Space Intelligence said in a statement posted to X.
Not everyone is treating the timing as coincidence. "I don't know if they're linked," former Department of Transportation Inspector General Mary Schiavo said on CNN. "But it's just too much coincidence that they were trying to start that moving today — and now we have problems with the system."
Controllers Flagged Concerns Weeks Ago
Friday's events landed with extra weight because the aviation workforce had already raised alarms about SMART in writing. In October, more than two dozen lawmakers wrote to Transportation Secretary Sean Duffy and FAA Administrator Bryan Bedford, relaying concerns from air traffic controllers about the deployment. That letter, as reported by Latin Times, stated that "the nation's frontline aviation safety workforce apparently had little to no input into SMART's development and have received limited training and information during the current deployment process."
The controllers specifically warned that SMART could "interfere with decision-making by experienced air traffic controllers" — or, in a more alarming scenario, that an AI system processing massive volumes of live data could hallucinate confident but incorrect output in a safety-critical environment. Lawmakers including Rep. Don Beyer had flagged FAA AI safety risks weeks before the disruption, and on Friday members of Congress from both parties began demanding answers about what went wrong.
Why This Matters Beyond One Bad Afternoon
Whatever investigators ultimately conclude, the incident is a stress test for the broader push to embed AI into safety-critical infrastructure. Congress approved $12.5 billion last year to modernize the nation's air traffic control system — replacing aging copper wiring with fiber optics, phasing out old radio systems and installing new computational platforms across the network. Transportation Secretary Duffy has publicly stated that another $30 billion will be required to finish the job. SMART is one visible piece of that overhaul.
The 2023 NOTAM outage, traced to a single corrupted database file that propagated into the backup system, demonstrated that failures in aviation infrastructure tend to find the gaps that architects didn't plan for. A brand-new advisory system drawing on 200 live data streams — including controller staffing and facility communications — layered on top of a live national airspace is precisely the kind of interaction investigators will now have to model, according to Latin Times' analysis of the investigation's direction.
For now, the official cause remains unidentified. What is known is that the failure involved communications infrastructure that SMART, as a routing and scheduling advisor, does not directly touch — a detail that, if confirmed, would point away from the AI system as the origin point. But the episode has already become a case study in how the United States deploys AI into systems where the cost of a bad day is measured in thousands of canceled flights, and where "you can't rule out anything" is the most honest answer any official can give.
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