CHICAGO (CBS) — Technical issues with a software system called Aerodata caused delays for several airlines nationwide Monday morning.

The Federal Aviation Administration told CBS News several carriers were “experiencing issues with a flight planning weight and balance program called Aerodata. Mainline operations and regional operations” were being “impacted to varying degrees.”

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Southwest Airlines issued a ground stop for all its flights for about 40 minutes, due to a technology issue with a vendor that provides aircraft weight and balance data. The ground stop was lifted around 6:30 a.m., and flights were resuming with delays.

United Airlines also experienced computer problems, and said it was working to get passengers in the air as soon as possible.

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Delta Air Lines, Alaska Airlines, and JetBlue also reported delays tied to a computer outage.

According to the Chicago Department of Aviation, only a handful of flight cancellations were reported Monday morning.

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There were 23 cancelled flights at O’Hare International Airport as of 7:30 a.m., and 16 at Midway International Airport. It was unclear how many of those, if any, were related to the computer issues.