WASHINGTON — Air travel across the United States suffered widespread disruption on Thursday as the Federal Aviation Administration (FAA) issued an unprecedented nationwide ground stop for all departing flights, triggered by a critical air traffic control communication failure.

The FAA implemented the emergency measure at approximately 4:00 p.m. EST, citing urgent safety concerns stemming from what officials described as an extraordinary technical anomaly. The directive barred all domestic departures indefinitely, while international arrivals were subjected to case-by-case routing management.

U.S. Transportation Secretary Sean Duffy confirmed that the outage impacted multiple Air Route Traffic Control Centers (ARTCC) nationwide. Technical teams were immediately mobilized to diagnose and resolve the communication breakdown.

Preliminary intelligence and law enforcement assessments indicate no immediate indication of foul play or a cyberattack. According to network reports citing law enforcement and federal sources, investigators are exploring several angles, including whether an internal software update or a glitch involving aviation wireless frequencies and pilot communication channels caused the system collapse.

Flight tracking aggregators estimated that nearly 3,100 aircraft were actively airborne and en route to U.S. destinations when the ground stop went into effect, with roughly 30,000 subsequent departures slated for the day. By 5:00 p.m. EST, domestic flight delays surpassed 8,000, accompanied by over 400 outright cancellations. Major aviation hubs, including Chicago and Denver, experienced severe congestion as frustrated passengers disembarked stranded aircraft and flooded terminal exits.

The federal ground stop marks the most severe systemic disruption to U.S. airspace since January 2023, when a crucial database file error paralyzed flight operations nationwide. Federal authorities stated that safety remains the absolute priority as technical specialists work around the clock to restore full operational capability.

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