A routine router switch by contractor L3Harris caused a system overload that grounded US flights nationwide.
The disruption led to more than 9,000 cancellations on Friday and over 5,000 on Saturday.
Federal officials and the FAA ruled out cyberattacks, sabotage, and artificial intelligence involvement.
Transportation Secretary Sean Duffy has called for $50 billion in funding to modernise ageing air traffic systems.
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