A disruption to a system housing United Airlines' flight information that delayed more than 1,000 flights and caused hundreds of flights to be canceled has been resolved, but travel disruptions continued into Thursday across the U.S.

The impacted system, called Unimatic, houses flight information that is fed to other systems including those that calculate weight and balance and track flight times, according to United. It’s not clear what caused the problem, which was resolved late Wednesday. While residual delays were expected, United said its team was working to restore normal operations.

“Safety is our top priority, and we’ll work with our customers to get them to their destinations,” the Chicago-based airline said in an emailed statement.

Jenny Billman said she and her husband were

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