FAA Nationwide Ground Stop Causes Massive Flight Delays and Cancellations at Chicago Airports

Hundreds of flights remained delayed or canceled at Chicago’s two major airports Friday evening after a rare nationwide ground stop.

The disruption, triggered by communications problems at regional air traffic control centers, left passengers wandering terminals and sitting on luggage as the scale of the outage became clear.

The Federal Aviation Administration lifted the nationwide ground stop around 7:30 p.m. Central time. According to real-time information from the Chicago Department of Aviation, nearly 900 flights were delayed at O’Hare International and Midway International airports as of 9:30 p.m., a slight decrease from more than 1,000 earlier in the evening. More than 800 flights remained canceled, with the majority of those cancellations concentrated at O’Hare.

Nationwide ground stop causes widespread flight disruptions at Chicago's O'Hare, Midway airports — ABC 7 Chicago

“There’s not a solidified, same answer from anyone,” said Shawntell Sharrock, a 35-year-old Colorado Springs native who described the scene near the O’Hare gates as “chaos.”

A massive telecommunications outage

The FAA imposed the ground stop due to “extraordinary circumstances and for reasons of safety,” according to an official notice. This is the first nationwide ground stop since January 2023, when a key FAA computer system malfunctioned. Prior to that incident, the last time had been after the September 11, 2001, attacks.

While the technical cause is still under investigation, federal officials have moved quickly to address fears of foul play. Secretary of Homeland Security Markwayne Mullin stated there was no indication yet that “this was a nefarious attack against us. It’s just a telecommunications outage.”

“Everybody’s safe. There’s no reason to be concerned about your loved ones if they’re flying,” Mullin said.

FAA ground stop issued at Chicago O'Hare, Midway airports; flights grounded nationwide — CBS Chicago

Mullin also said that investigators are looking into whether the outage is linked to the FAA’s recent nationwide rollout of an artificial intelligence system designed to identify problems and reroute aircraft. Although the new system operates from a single location near Washington, D.C., and provides recommendations rather than direct control, the timing of the failure suggests the nation's aviation infrastructure may be unstable.

The incident highlights the ongoing struggle to modernize an aging air traffic control network. While Congress approved $12.5 billion last year to replace outdated copper wiring with fiber optic lines and upgrade radio systems, the transition is far from complete. Sean Duffy has indicated that an additional $30 billion will be required to finish the overhaul, a request currently being lobbied for by the White House.

The @FAAnews issued a nationwide ground stop for all U. S. airports following a communication issue impacting all Air Route Traffic Control Centers. FAA technicians are investigating the issue. We will provide immediate updates as we have them.

— Post by @SecDuffy on X

Technical failures cause personal loss for travelers

For those caught in the middle, the technical failure translated into significant personal loss. Pankti Patel, 44, sat in Terminal 3 at O’Hare after her 1:30 p.m. flight failed to depart. The delay had cost her a long-awaited weekend trip to Napa Valley with her sister, a reunion the pair had not shared in 20 years.

“I don’t know when I’ll be able to make these kinds of plans again,” Patel said.

FAA lifts nationwide ground stop after hours of flight disruptions — Scripps News

Airlines are now working to stabilize their schedules, though significant delays are expected to persist. United Airlines confirmed it is resuming some planned Friday night operations but acknowledged a “significant number” of cancellations.

The carrier has issued a travel waiver allowing customers to change plans this weekend. American Airlines is prioritizing international flights and service to non-hub cities to help reposition crews and aircraft for a recovery in the coming days.

Airport/Entity	Status as of 9:30 p.m.
O’Hare & Midway (Combined)	Nearly 900 flights delayed
O’Hare & Midway (Combined)	More than 800 flights canceled
United Airlines	Resuming some Friday night flights

The scale of the outage has drawn scrutiny from lawmakers. U.S. Sen. Tammy Duckworth, an Illinois Democrat, said the cause of the ground stop warrants a “thorough and complete investigation,” according to a post on X.

Passengers walk through terminal of the ohare international airport ord sunday mar in chicago

Aviation safety expert and former United Airlines pilot Steve Arroyo said that the decision to ground planes was a necessary safety measure given the communication failures.

“If you don’t have that ability, whether it’s because the old wires that they have are just run down or for whatever reason, you’ve got to stop airplanes on the ground,” said Steve Arroyo. “And not put them in the air where you’re going to risk not being able to communicate with them.”

As airlines work to restore their full schedules, the FAA continues its investigation into the specific telecommunications failure that triggered the nationwide halt.