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A communication system failure grounded flights across the U.S., highlighting concerns about the outdated air traffic control network despite ongoing modernization efforts. The FAA suspended all flights due to a nationwide communication issue affecting control centers. Secretary Sean Duffy attributed the disruption to overloaded switches and routers, with unclear causes for the overload. After over four hours, the flight ban was lifted, but full operational capacity would take time to restore. The incident coincided with a request for $30.1 billion from Congress for further modernization. The GAO reported that many FAA systems are unsustainable, and the agency struggles with outdated technology and lack of coordination in modernization plans.