United Airlines flights across the U.S., including those in Newark , Chicago , and Houston , were halted and even canceled on Wednesday evening before 9pm ET due to a system outage.

Roughly an hour later, flights have resumed, though travelers should expect delays.

United Airlines resumes flights

According to an Instagram Story from United Airlines , “The underlying technical issue has been resolved, and, while we expect residual delays, our team is working to restore normal operations.”

Those who are in the midst of traveling can check their flight status online .

This is a developing story. Please stay tuned for more details.

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