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A computer repair in the US caused the Notam (NOTAM) system to inform pilots and aircraft operators.
As a result, 5,400 flights were ordered to be delayed and grounded. About 900 flights were forced to be cancelled.
Scheduled air traffic across the US was disrupted for several hours following the technical glitch. Now the flight services have resumed gradually. All aircraft in the sky can be safely landed, officials said.
President Joe Biden has been briefed by the Transportation Secretary on the failure of the air traffic control system, and President Joe Biden has ordered a full investigation into the cause. .