The FAA Blamed a Telecom Outage. Verizon Says Its Network Was Fine.

At 3:54 p.m. Eastern on Friday, the Air Traffic Control System Command Center pushed advisory 111 to every aircraft operator in the United States: all airports ground stopped, all departures held “until further notice,” inbound international flights handled case by case. By 4:45 p.m. FlightAware counted more than 7,800 flights delayed and about 350 cancelled. It was the first nationwide stop since January 2023, when the pilots’ safety-notice system failed.

The FAA blamed a “temporary telecommunications outage.” Within two hours the company holding its telecom modernization contract had said its network was fully functioning. Something stopped carrying the clearances that keep aircraft apart, and nobody had publicly said which link failed, who operates it, or when the airspace would reopen.

The escalation took 44 minutes

The advisory stack moves faster than the press conferences. Advisory 107 ground-stopped flights into Chicago O’Hare at 3:10 p.m. for an equipment outage, noting “comms issues”; Midway followed at 3:17; advisory 108 activated “all airports diversion recovery” at 3:30; advisory 111, the national order, at 3:54; 116, nationwide airborne holding, at 4:20; 117, extended flight plan drop times, at 4:21. Six advisories in 71 minutes, and the step from two Chicago airports to every airport in the country took 44 of them.

Cirium had 11,000 departures scheduled after 4 p.m., about 26 a minute across the seven-hour window printed on the notice, so an order that runs to its own stated end parks nearly 11,000 departures — before Flighty’s 30,000 departures and arrivals still due that day.

Sixty-six minutes to a cause, ten of them backwards

Advisory 111 went out at 20:54 UTC. Just after 5 p.m. Eastern, 66 minutes later, the FAA posted that a “temporary telecommunications outage” had caused the halt.

At about 5:20 p.m. an airline source told CNN that ten minutes earlier, on the FAA’s own crisis call, there was “still no clear answer as to a cause.” The public cause preceded the agency’s internal certainty by ten minutes, and “telecommunications” named a category, not a component. An Alaska Airlines internal message seen by CNBC logged communications and radar problems together; controller radio traffic captured by ATC.com had it as “we lost all of the frequencies and all of the automation for the handoff and strips,” with Chicago Approach declaring “ATC Zero” — no control service available. Not a slow system. A coordination layer gone.

The vendor says the pipes were fine

At 22:54 UTC, ABC reported that Verizon — holder of a 15-year FAA contract potentially worth $2.4 billion to upgrade agency systems — said its network was “fully functioning” and that it knew of no air traffic control issue. That is not a denial of the outage. It is the absence of an owner for it.

The money explains why. Congress approved $12.5 billion last year to swap copper for fiber and replace radios; Transportation Secretary Sean Duffy says $30 billion more is needed. That is a $42.5 billion program in which the Verizon telecom piece is 5.6 percent, while the unfunded remainder is 2.4 times what has been appropriated. The visible layer gets the demonstrations; the carrying layer gets the deferred invoice, and the outage lands there.

The AI question arrived before the cause did

Homeland Security Secretary Markwayne Mullin said investigators would look at any link to SMART, the FAA’s new AI airspace planning system, and that nothing was ruled out. The timing invited it: SMART began in the Washington area on September 21, and its national expansion — covering airspace managed by all 22 regional control centers — was announced three days before the stop. Per AP it runs from one location near Washington and only sends recommendations to the centers.

That architecture argues both ways. An advisory-only layer should have a blast radius of zero, which makes it a poor suspect. It also means that when the transport layer dies, the planning layer cannot help: 200 data streams of foresight above a clearance path that failed as a single event across 22 facilities. The question is not whether the AI did it, but why the layer that only recommends has two hundred inputs while the layer that carries the clearances has whatever is on the pole.

What to watch

• Whether the FAA names the failed system and its operator rather than the category, and whether the Verizon contract’s scope is amended.
• Whether SMART’s expansion is paused pending a review that publishes a minute-by-minute timeline, as the 2023 failure eventually did.
• The lift time: January 2023’s stop ran about 112 minutes; Friday’s notice alone carried a 426-minute window, 3.8 times as long, before any cause was named.
• Whether Senator Tammy Duckworth’s demand for answers becomes a formal inspector-general review, and whether the $30 billion moves.

Sources: FAA ATCSCC advisory 111, CNN, CNBC, AP, ABC News, New York Times, USA TODAY, FAA SMART fact sheet.