(CNN) — United Airlines halted its mainline flights out of departure airports Wednesday night due to a “technology issue,” the airline told CNN.

“Due to a technology issue, we are holding United mainline flights at their departure airports,” an airline spokesperson said in a statement. “We expect additional flight delays this evening as we work through this issue. Safety is our top priority, and we’ll work with our customers to get them to their destinations.”

At 8:30 p.m. ET, about 16% of the carrier’s flights were delayed and a handful had been canceled, according to flight data tracker FlightAware.

Airports in Chicago, Denver, Newark, Houston and San Francisco all had been impacted, according to the Federal Aviation Administration system status .

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