Thousands of U.S. flights were canceled and delayed Saturday as airlines struggled to rebuild schedules after a nationwide Federal Aviation Administration communications failure triggered the longest nationwide ground stop since the September 11, 2001, attacks.
The FAA halted departing flights across the country for more than four hours Friday after instability affected communications and radar information at multiple Air Route Traffic Control Centers. Aircraft already in the air were permitted to land, while planes on the ground were held at airports until the system could be stabilized.
The nationwide stop was lifted at approximately 8:15 p.m. Eastern time Friday, but the damage to airline networks continued into the weekend. Reuters reported that more than 6,600 flights were canceled and approximately 8,600 were delayed during the disruption, with additional cancellations already appearing for the following days. The Associated Press reported more than 2,500 Saturday cancellations as airlines repositioned crews and aircraft.
What caused the shutdown?
Transportation Secretary Sean Duffy said switches and routers supporting the air traffic system became overloaded with data and began returning inconsistent information. Controllers did not completely lose radar or communications, officials said, but the instability was serious enough that the FAA stopped departures nationwide to protect passengers and crews.
Homeland Security officials said investigators had found no evidence that the incident was a cyberattack. Officials also said the failure was not caused by the FAA’s new artificial-intelligence system. The immediate problem was linked to older infrastructure operating alongside technology upgrades.
The FAA’s initial official statement said communications problems were affecting multiple control centers. A later FAA advisory confirmed that the nationwide ground stop had been canceled after systems recovered.
Passengers could feel the effects for days
A nationwide shutdown creates a chain reaction because aircraft, pilots and flight attendants end up far from their scheduled locations. Even after departures resume, airlines must reposition planes and crews while complying with federal work-hour and rest requirements.
Passengers crowded terminals from Boston and New York to Chicago, Los Angeles and Seattle. Some arriving aircraft waited on taxiways because gates remained occupied by planes that could not depart. International service was also affected, with flights from Canada and Europe canceled or held.
The Associated Press reported that sports teams changed travel plans, chartered buses or adjusted schedules. Officials said more than 3,000 flights landed safely during the shutdown and that no aircraft were in immediate danger.
Aging equipment is again under scrutiny
The outage renewed concern about aging American air traffic infrastructure. The FAA has been replacing copper wiring, updating radios and modernizing equipment after Congress approved $12.5 billion for upgrades. The administration is seeking billions more to complete the work.
The United States experienced another nationwide ground stop in January 2023 when the system used to distribute safety notices to pilots failed. That shutdown lasted about 90 minutes. Friday’s stoppage was considerably longer and occurred weeks before the busy Thanksgiving travel period.
What travelers should do
- Check the airline’s app or website before leaving for the airport, even if the flight previously appeared on time.
- Use the airline’s rebooking tools first; telephone and airport customer-service lines may have long waits.
- Keep receipts for hotels, meals and ground transportation in case the airline offers reimbursement or travel-credit relief.
- Do not assume federal compensation rules apply. Because the failure originated with the FAA rather than an airline, carriers generally are not required to provide cash compensation, although individual airline policies may offer assistance.
- Allow extra time for security, baggage rechecking and missed connections while airlines restore their schedules.
Aviation analysts warned that schedule disruptions could continue for several days. Officials said the immediate technical failure had been corrected and flying was safe, but the episode demonstrated how a communications problem in the national air traffic network can rapidly affect nearly every major U.S. airport.
