The airlines used Twitter to announce that they are working to resolve the problem, but the company has had nothing further to say about the outage.
In August, a computer snafu caused delays of up to 2.5 hours for some passengers. In June 2011, a problem with its computers lasted 5 hours and disrupted the travel plans of thousands of customers.
Reports are sketchy, but passenger delays have been reported in Chicago and Houston.
Shortly after 11:00 a.m. ET, Reuters reported that the issues have been resolved and operations are resuming for flights affected by the outage.
United Continental stock is trading at $19.81, down about 0.9% in a 52-week range of $15.51 to $25.84.
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