Air traffic in the U.S. has been severely affected, with hundreds of flights delayed and many canceled after a major technical malfunction.

Information from the U.S. Federal Aviation Administration (FAA) and a flight tracking system was reported on Wednesday.

The system that provided pilots and ground staff with information about flight disruptions has failed, according to the FAA’s website.

“Operations across the National Airspace System are affected,’’ the FAA wrote on Twitter.

It added that the system was being reloaded.

“While some functions are beginning to come back online, National Airspace System operations remain limited,’’ it said.

According to the website flightaware.com, by the morning more than 1,250 flights within, to, or from the U.S. were delayed and over 100 were canceled.

It was not clear to what extent the computer failure was the reason for the disruptions.