FAA Grounds Every US Flight Over Air Traffic Control Communications Outage

The FAA halted every flight in the United States on November 13 after what Transportation Secretary Sean Duffy called a "communication issue impacting all Air Route Traffic Control Centers." Passengers were pulled off planes. Departure boards flashed red. Aircraft sat parked back-to-back on the tarmac at Chicago O'Hare.

The agency ordered the stop "due to extraordinary circumstances and reasons for safety." On Friday afternoon, the FAA posted on X that a temporary telecommunications outage was to blame.

"Out of an abundance of caution, all flights have been halted," the FAA said. "Every flight has been accounted for and international flights will be handled on a case by case basis."

Duffy confirmed that technicians are at work. "FAA technicians are investigating the issue," he wrote on X.

How rare is a national ground stop?

The answer is: extremely. The last comparable event came in January 2023, when the FAA halted flights because of an outage involving its pilot alert system. Before that, nationwide air traffic stopped only after the September 11, 2001, terrorist attacks. A communications failure that touches every Air Route Traffic Control Center at once sits in that same small category of systemic breakdowns.

The mechanism matters here. Air traffic control centers route aircraft between airports across the country's airspace. When the phone and data lines connecting those centers fail, controllers cannot coordinate handoffs between sectors, and the safest option is to keep aircraft on the ground rather than launch them into airspace nobody can track.

The FAA has said it is prepared to make a system update, signaling that the fix may involve a deliberate technology change rather than waiting for the outage to clear on its own.

What are passengers seeing on the ground?

The stop became a multi-hour ordeal. At airports across the country, the pattern repeated: crowded boarding areas, orders to leave flights, and scrambles to find checked luggage.

• Passengers wait in terminals at McGhee Tyson Airport and Dulles International, where security lines grew longer as stranded travelers congregated.
• At Logan International in East Boston, a lone traveler stood before a departures board dominated by delays.
• At JFK International in New York City, a passenger walked past a board displaying delayed flights.
• Traffic piled up outside the terminal at Dulles in Virginia as the stop stretched on.
• At Salt Lake City, queues formed near Gate 8 after passengers were told to disembark a flight to Chicago.

Jon Lett, a passenger traveling from Salt Lake City to Chicago, told Business Insider that everyone on his flight was ordered off the plane and told to wait. He said the mood among passengers remained "chill," but there was no telling whether his flight would depart anytime soon.

What happens next?

Transportation officials have not yet said what triggered the outage, and the exact cause remains unclear. The FAA's statement that international flights will be handled case by case suggests the system is not returning to normal in one switch.

For airlines, the stop creates a scheduling backlog that will take hours to unwind even after controllers clear the fault, since aircraft and crews are now parked in the wrong places for the day's remaining rotations. A January 2023 precedent shows how this plays out: the alert-system outage ended within hours, but delays rippled through schedules for the rest of the day.

Until the FAA confirms its system update is complete, the operating question for every carrier and traveler in the country is when, not whether, the first departures resume.