United Airlines has suspended flights nationwide on Aug. 6 due to a technical issue, causing disruptions at major airline hubs, including Chicago, Denver, and Houston.

The airline expected additional flight delays in the evening as it investigates the issue. Ground stops were issued for United Airlines flights at multiple airports across the country, according to the Federal Aviation Administration.

"Due to a technology issue, we are holding United mainline flights at their departure airports," United Airlines said in a statement to USA TODAY. "Safety is our top priority, and we’ll work with our customers to get them to their destinations."

A system outage was causing flight disruptions at Newark Liberty International Airport and other airports, with some travelers delayed for hours, th

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