All flights in United States airspace have made an emergency landing.
The reason is an error in the operating program system that serves to manage air traffic control.
The Federal Aviation Administration reports that the problem has affected the territory of the entire country.
Shortly before 7 a.m. ET (2 p.m. BST), there were nearly 1,200 delayed flights in, to, or out of the United States, according to flight tracking website FlightAware, the Associated Press and BTA reported.
Most of the delays are along the east coast.
The agency said on Twitter that it is working to restore its notification system.
“We are currently performing final validation checks and reloading the system,” management said.
“Operations in the national airspace control system are affected,” it added.
The administration is working to restore what is known as the “Notification of Air Missions System” (NOTAM).
The system provides information ranging from airport construction to emergency flight restrictions or damaged equipment. All aircraft must interface with the system, including civilian and military flights.
The agency indicated that it will provide frequent updates on the progress of fixing the problem.