On Friday, the Federal Aviation Administration (FAA) announced a nationwide ground-stop order that halted all scheduled departures in the United States. According to FlightAware, roughly 7,000 flights were delayed or cancelled because of the stoppage.

In a post on X, Transportation Secretary Sean Duffy attributed the disruption to a communication issue that impacted every Air Route Traffic Control Center, and he confirmed that FAA technicians are working to identify the root cause.