WASHINGTON, Aug 6 (Reuters) - United Airlines said it had grounded its flights at U.S. airports on Wednesday due to a technology issue, and warned of additional flight delays in the evening.

“Due to a technology issue, we are holding United mainline flights at their departure airports,” the airline said.

United suffered an outage of its weight calculation system, a source familiar with the matter told Reuters.

The U.S. Federal Aviation Administration said earlier it issued a ground stop for United flights at several U.S. airports.

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