A disruption to a system housing United Airlines' flight information that caused more than 1,000 delays has been resolved, but delays continued into Thursday.

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.

About 35% of all the airline’s flights were delayed and another 7% were canceled Wednesday, according to FlightAware, a website that tracks flight disruptions. By Thursday morning, 4% of United flights for the day were delayed and 4% were canceled.

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