The US Federal Aviation Administration (FAA) on Friday ordered a nationwide halt to aircraft departures because of "extraordinary circumstances" that government officials said was related to a communications issue.
The FAA, in an advisory at 3:54 pm ET, ordered all departing aircraft to be "ground stopped" until further notice because of "extraordinary circumstances and for reasons of safety". Inbound international flights will be managed on a case-by-case basis, the FAA said in the advisory.
US transportation secretary Sean Duffy said the nationwide ground stop was issued "following a communications issue" that was affecting facilities that manage air traffic control across the US.
"FAA technicians are investigating the issue," Duffy wrote in a social media post. "We will provide immediate updates as we have them."

