Routine Equipment Upgrade Caused Nationwide Flight Grounding

Transportation Secretary Sean Duffy stated that a nationwide ground stop affecting U.S. flights originated from routine maintenance. An FAA contractor, L3Harris, was upgrading copper wire to fiber optic cable at a remote location when a router overloaded a critical communication system, causing network instability. Following the incident, the FAA disabled the problematic connections to stabilize the network and began a root cause analysis to determine if user error or a faulty router was to blame. Officials ruled out artificial intelligence or nefarious activity as the cause of the disruption. The ground stop led to the cancellation of more than 8,200 flights on Friday evening, with at least 3,000 additional flights canceled on Saturday. This marked only the third nationwide ground stop of the 21st century.