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A technology issue caused a ground stop on all United Airlines flights destined for Chicago and numerous other major hubs around the U.S. Wednesday night.

According to an alert on the FAA’s website, all United Airlines flights destined for Chicago were halted at their departing airports at approximately 6:30 p.m.

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As of 8:30 p.m., United flights departing from O'Hare were delayed an average of 120 minutes, according to the FAA.

Just before 9 p.m. Central time, the company said that the underlying issues had been resolved, and that they were beginning to work through the backlog of flights to get travelers moving again.

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