Thousands Of U.S. Flights Paused Due to FAA Systems OutagePlanes across the country were halted as the Federal Aviation Administration (FAA) said it experienced a system outage.

ByGabrielle Bienasz

Opinions expressed by Entrepreneur contributors are their own.

SAUL LOEB / Contributor I Getty Images
Plane leaves Newark International Airport on January 11.

Thousands of flights across the U.S. were delayed early Wednesday due to a systems outage from the Notice to Air Missions (NOTAMs) system, the Federal Aviation Administration (FAA) said.

Flight Aware, perThe New York Times, showed some 4,500 flights departing from and arriving in the United States, or within it, were delayed on Wednesday.

White House Press Secretary Karine Jean-PierreTweetedthat "there is no evidence of a cyberattack at this point."

What is the Notice to Air Missions (NOTAMs) system?

The FAA uses theNotice to Air Missionssystem, or NOTAMs, to alert "personnel concerned with flight operations," about any issues in the country's airspace, which is officially known as theNational Airspace System(NAS).

Following an outage, around 7:20 a.m. EST, the FAAaskedall domestic flights to pause departure until 9 a.m. ET.

At around 8:15 a.m. EST, the FAATweeted, "Update 4: The FAA is making progress in restoring its Notice to Air Missions system following an overnight outage. Departures are resuming at@EWRairportand@ATLairportdue to air traffic congestion in those areas. We expect departures to resume at other airports at 9 a.m. ET."

The agencyfollowed upabout 40 minutes later to say that operations are "resuming gradually across the U.S. following an overnight outage to the Notice to Air Missions system that provides safety info to flight crews. The ground stop has been lifted."

"We continue to look into the cause of the initial problem," the agency added.

Related:'Nightmare': Customers 'In Tears' As Southwest Cancels Over 70% of Flights, Prompting Probe By Department of Transportation

Customers seemed annoyed. "Total mess at the gate," one user wrote, who said they were in the Honolulu airport.

"An FAA outage is impacting all flights including all carriers. We sincerely appreciate your patience as they work to resolve this," American Airline's Twitter account wrote back.

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Gabrielle Bienasz is a staff writer at Entrepreneur. She previously worked at Insider and Inc. Magazine.

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