Following a computer breakdown reported by the Federal Aviation Administration, flights across the United States were impacted on Wednesday morning.

Following the incident, all planes within the United States were grounded, a source with knowledge of the case told NBC News.

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The Notice to Air Missions (NOTAM) system “failed” on Wednesday morning, the FAA stated in a notice posted on its website. A NOTAM is a notice that includes information that is crucial for those working in flight operations.

What is NOTAM?

A NOTAM is a notice that contains information that is crucial to those involved in flight operations but is not known far enough in advance to be made public in any other way. It describes a component of the National Airspace System (NAS) in an abnormal rather than a normal state.

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The timely knowledge of such information is crucial for the personnel and systems involved with flight operations. NOTAMs are unclassified notices or advisories distributed via telecommunication that contain information about the establishment, conditions, or change in any aeronautical facility, service, procedure, or hazard.

Airport operators and government organizations produce and transmit NOTAMs in accordance with the requirements of Annex 15: Aeronautical Information Services of the Convention on International Civil Aviation (CICA)

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Recently, flights across the US were halted after the Federal Aviation Authority (FAA) announced that their NOTAM system had stopped working due to a technical glitch. This was for the first time in history.

In a notice issued by the FAA, “Technicians are currently working to restore the system and there is no estimate for restoration of service at this time,” it said.

According to internet flight tracker FlightAware, as of Wednesday morning at 6:30 a.m., about 760 domestic, international, and transatlantic flights were delayed. There were about 90 flights listed as canceled.

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“Operations across the National Airspace System are affected,” the FAA said in a statement.

“The FAA is working to restore its Notice to Air Missions System. We are performing final validation checks and repopulating the system now,” it further stated..