A major disruption has occurred at the American Federal Aviation Administration (FAA).
According to the FAA website, the system that provides pilots and ground staff with information about disruptions in the flight process has failed.
Technicians worked to fix the problem.
The system will be restarted, the FAA said in a first message via the short message service Twitter.
In a further message in the early afternoon, German time, the air traffic control had asked the airlines to suspend all flights within the USA.
The stop should last until at least 9 a.m. (EST) to allow the authority to check the failed information system.
Air traffic is affected.
How big the impact is, however, was not initially clear.
According to the Flightaware.com website, more than 1,200 flights within, to or from the United States were delayed on Wednesday morning (local time), and around 90 were canceled.
It was not clear whether the computer failure was the reason for the disruption.
According to reports from the television channel CNN, the airline United Airlines temporarily stopped all domestic flights.
American Airlines is monitoring the situation and is working closely with the FAA to minimize the impact, CNN reported.
Instructions and information about temporary or permanent changes to the Aeronautical Information Publication, which are important for orderly, safe and smooth air traffic, are transmitted to pilots via the "Notice-to-Airmen" system (NOTAM).