File - An United Airlines plane takes off at Chicago O'Hare International Airport on Monday, Jan. 28, 2019 in Chicago. (Stacey Wescott/Chicago Tribune)

       NEW YORK — United Airlines suffered a brief system outage early Friday and the Federal Aviation Administration issued a ground stop of less than an hour for all United flights.

       The ground stop order was lifted before 8 a.m. at the airline’s request, according to an advisory issued by the FAA.

       “We experienced a system outage this morning, but everything is up and running and operations have resumed,” the Chicago airline said just after 7 a.m. Chicago time on Twitter.

       It was unclear how many delays occurred, or if there were any related cancellations.

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