For a few hours on Friday, the busiest aviation market on Earth simply stood still. The Federal Aviation Administration halted every departing flight in the United States after the communications backbone of its air traffic control system failed, and only reopened the skies at 8:15 p.m. Eastern time. By then the stoppage had lasted roughly four and a half hours, and airports from Boston to Los Angeles were packed with stranded travellers.
The scale is striking. FlightAware counted well over 10,000 delays and several thousand cancellations, while around 1.5 million passengers were reportedly stuck. Some 3,100 aircraft were already airborne towards American airports when the order came; they were allowed to land as normal. Nothing comparable had happened across the whole country since the days after 9/11.
So what broke? Not a hacker, officials insist. Homeland Security Secretary Markwayne Mullin said there was no sign of a cyberattack and no link to this week’s worldwide Microsoft disruption. In his account, fresh security patches loaded onto an old network overwhelmed its routers. Transportation Secretary Sean Duffy put it more bluntly, describing an “incredibly old” system whose routers became flooded with data and began returning inconsistent information, so controllers shut it down. The network is run by contractor L3Harris under a deal that goes back to 2002, and an FAA-commissioned review warned as early as 2023 that it was obsolete.
The administration wasted little time turning the outage into a funding argument. Duffy told reporters the country would see “more of these” unless Congress pays for new equipment, and Mullin said patching was not enough: the White House wants a full replacement, put at about $50 billion.
Recovery will take a while, because planes and crews are now in the wrong cities. Airlines expect knock-on delays for days, though Duffy predicted operations would be back to normal before the Thanksgiving rush at the end of the month.
