PA MediaThe US Federal Aviation Administration (FAA) has grounded all flights nationwide because of communications problems at regional air traffic control centres.
The FAA notice said the ground stop was being imposed “due to extraordinary circumstances and for reasons of safety”.
Transportation secretary Sean Duffy said there is a communications issue affecting the 22 regional air traffic control centres that direct planes en route between airports nationwide.
He said FAA technicians are investigating.
This is the first nationwide ground stop since January 2023 when a key FAA computer system malfunctioned.
Before that the last time had been after the September 11 2001 attacks.
The government has been working to overhaul the outdated technology that air traffic controllers rely on since Congress approved 12.5 billion dollars for the project last year.
Miles of old copper wires have been replaced with fibre optic lines and old radio systems are gradually being replaced at airports across the country.
But much work remains.
Mr Duffy has said that another 30 billion dollars will be needed to complete the work, and the White House has begun lobbying Congress to approve it.
It may be linked to the outdated technology used by air traffic controllers.
“If you don’t have that ability, whether it’s because the old wires that they have are just run down or for whatever reason, you’ve got to stop airplanes on the ground,” said Mr Arroyo, who is a former United Airlines pilot.
“And not put them in the air where you’re going to risk not being able to communicate with them.”
Friday’s ground stop was different to the one after September 11 because planes were not being told to land immediately and pilots probably were able to communicate with ground controllers at airports, Mr Arroyo said.
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