Federal aviation officials received repeated warnings that efforts to modernize the United States’ air traffic control network could disrupt its operations, The Washington Post reported after a nationwide ground stop halted departures for more than four hours on November 13.
The Post’s report said government reports had outlined the risks in the months and years before the shutdown. The findings put the handling of the transition from aging equipment to newer systems under scrutiny as investigators work to establish what went wrong.
Maintenance work comes under scrutiny
Transportation Secretary Sean Duffy said Saturday that the disruption began while contractor L3Harris was updating telecommunications infrastructure at a remote location, according to NPR. The work involved replacing copper connections with fiber optics.
Duffy said investigators were examining whether an installation mistake or faulty router triggered the problem. The precise error, and whether L3Harris was responsible, had not been established at the time of that briefing.
L3Harris said it was supporting the FAA’s investigation and had completed more than 70 percent of its copper-to-fiber conversions, NPR reported.
Departures resumed, but disruption continued
The FAA lifted the nationwide ground stop Friday evening after communications problems affected regional air traffic control centers. The agency said it tested its systems for stability and reliability before allowing departures to resume, according to The Associated Press.
The order restricted departing aircraft; it did not mean every aircraft already in flight was immediately grounded. Hundreds of flights were diverted during the disruption, AP reported.
Airlines continued dealing with cancellations and delays on Saturday. The flight disruption also moved the BYU–Baylor kickoff to 7 p.m. ET. FAA Administrator Bryan Bedford said at Saturday’s briefing that scheduling problems were expected to be resolved by Sunday evening, NPR reported. That was a forecast, not confirmation that operations had returned to normal.
Modernization faces questions over the transition
Congress approved $12.5 billion in July 2025 to modernize the aging air traffic control system, according to NPR. Duffy used Saturday’s briefing to call for further investment.
The investigation now has to distinguish the limitations of older equipment from any failures in the installation and testing of its replacements. The Post’s account of earlier warnings raises questions about how those transition risks were managed, but does not by itself establish the technical cause of Friday’s outage.
