Updated

The Federal Aviation Administration said the root cause of a nationwide ground stop remains unknown, though routers and networking equipment may be involved. CNBC Top News reported that officials have not yet established a definitive cause for the problems that led to the halt, which grounded departures nationwide for more than four hours. Two days later, flight disruptions were still lingering as airlines worked to recover, and one headline quoted travelers saying they had slept in airports. CNBC Top News reported that Trump blamed the Biden administration for the FAA's aging system after the stop and urged Congress to approve more funding. The sources reviewed do not give the number of flights affected or a timeline for the agency's findings.