FAA Ground Stop Cancels More Than 12,000 Flights as Duffy Seeks $50 Billion

The FAA lifted a nationwide ground stop at about 8:15 p.m. ET Friday after roughly four hours, but the disruption carried into Saturday. FlightAware data showed more than 9,100 flights canceled Friday and more than 3,000 cancellations by Saturday morning, leaving tens of thousands of passengers in airports overnight. Transportation Secretary Sean Duffy said the stop began at 3:36 p.m. after instability in radar and communications at centers across the country. Airlines faced slow recovery and rebooking. The evidence is mixed on cause. FAA said it tested systems and confirmed stability before clearing flights. Duffy said older switches and routers overloaded with data while new IP switches stayed up, citing legacy copper lines. Homeland Security Secretary Markwayne Mullin said new equipment bolted onto the network had overwhelmed the older system. He said investigators found no sign of a cyberattack but did not rule out a link to a new AI traffic-control tool being rolled out. CISA was examining the AI tool link. The funding request moved faster than the system. On Thursday, Duffy and budget director Russ Vought asked appropriators for $30.1 billion, matching a Senate bill framework. By Friday night, Duffy demanded $50 billion, saying it was an emergency. Mullin put a complete overhaul near that figure. Congress had already provided $12.5 billion in the July 2025 reconciliation law, while the FAA's January estimate was at least $32.5 billion. The shift shows how a single failure can reprice a long-running modernization dispute. The stakes are operational and fiscal. Passengers, airlines and cargo shippers absorbed delays, overnight stays and rebooking costs. The federal government now faces pressure to fund a larger overhaul than previously proposed, while Congress is being asked to weigh emergency money against accountability for upgrades that officials say were assembled incrementally. The episode exposes a dependency: modern air travel runs on infrastructure whose failure can halt departures nationwide, making maintenance and integration a national economic issue.