Paralysis of the US air traffic system.
The FAA grounded all departures across the country for nearly 4 hours due to a failure of radar and communications systems. Over 13,000 flights were canceled or delayed.
Reason: Transport Secretary Sean Duffy blamed outdated infrastructure congestion from the 1980s. Authorities found no signs of a cyber attack despite initial theories of an AI hack. The investigation continues.
Operations resumed Friday evening, but airlines face significant recovery time as planes and crews are stuck at the wrong airports. This is the worst disruption since 2001.