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United Airlines grounded all mainline flights due to a fire alarm at its Chicago operations center.
United Airlines briefly grounded all its mainline flights across the U.S. on Thursday due to a fire alarm at its operations center in Chicago.
Employees evacuated to a backup facility before returning to the main center, lifting the ground stop.
While United Express regional flights were unaffected, some mainline flights experienced delays.
This incident follows previous operational issues faced by the carrier.
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United Airlines puso en tierra todos los vuelos de la línea principal debido a una alarma de incendio en su centro de operaciones de Chicago.