United Airlines operations center alarm causes brief nationwide ground stop

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United Airlines issued a nationwide ground stop for all of its mainline flights late Thursday after an emergency alarm at its Chicago operations center. 

« A fire alarm sounded at our operations center, which caused employees to move to our nearby backup facility and resulted in a brief nationwide ground stop of United aircraft, » the company told Fox News Digital in a statement. « Employees have returned to our primary operations center, and the ground stop has been lifted. »

United Airlines plane in San Francisco, California

A United Airlines passenger plane is seen at San Francisco International Airport. (Tayfun Coskun/Anadolu via Getty Images / Getty Images)

The company said that no flights were diverted and that its regional line, United Express, was unaffected. 

Ticker Security Last Change Change %
UAL UNITED AIRLINES HOLDINGS INC. 89.73 -0.70 -0.77%

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United Airlines has the largest fleet of any American airline, operating 1,023 aircraft, according to Business Insider.