US Aviation Agency Lifts Nationwide Ground Stop Following Major Communication System Failure

UPDATE - follow-up to FAA grounds departing flights nationwide, citing air traffic communication system outage: The Federal Aviation Administration paused all outbound flights across the United States at around 4 p.m. on Friday due to communication problems at several air traffic control centers.

What Happened

Homeland Security Secretary Markwayne Mullin stated at the White House that officials found no sign of any security threat to the country. The FAA reported a temporary telecommunications outage and halted departures for safety reasons. Internal messages from Alaska Airlines indicated the trouble involved communication and radar equipment. Flight-tracking data from Flightradar24 showed some outbound international flights managed to leave by late afternoon, while flights already airborne continued their journeys. The FAA began allowing departures to resume around 6 p.m. as facilities recovered.

Impact

The sudden stoppage disrupted hundreds of flights and led to about 600 total diverted flights, with 104 sent to alternate airports. Flight-data firm Cirium noted that 11,000 flights had been scheduled to leave U.S. airports after the 4 p.m. cutoff. Experts pointed out that such ground stops often cause snowballing delays when flight crews exceed their legal daily working hours.

Context

Nationwide ground stops are extremely rare in American aviation history, with prior incidents occurring during the January 2023 pilot alert system failure and after the September 11 terrorist attacks. The United States has faced multiple aviation tech disruptions in recent years, including a cut fiber cable in New Jersey and a 2025 communication blackout near Newark.