Officials' varying explanations deepen doubts about the shutdown of US airspace.
The FAA grounded all departing flights in the US on Friday between 3:54 p.m. and 8:15 p.m., citing a “temporary communications blackout. Transport Minister Sean Duffy said old switches and routers were "overloaded with data", admitting: "We're using small copper lines from the 1980s. "Homeland Security," Markwayne Mullin, said there was nothing to indicate a cyberattack but officials "are still looking." “The September GAO report flagged 1960s-era copper cables and overlapping transitions. Over 12,500 flights were canceled over two days, with 827 diversions. Duffy asked for $50 billion in emergency funding.