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An overnight computer network upgrade that didn’t get back up and running quick enough caused delays at Calgary International Airport on Friday morning.

Calgary Airport Authority spokeswoman Jody Moseley said that as of 11:40 a.m., most of the system was operating and things were returning to normal.

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“As a result of a critical upgrade we needed to do from the back end of our network system, some of our systems did not come back online as planned,” said Moseley.

“Our teams here responded as quickly as we could to get our systems back up, but what really were impacted were a lot of our passengers.”

Moseley said the checkin kiosks and the boarding processes were impacted the most.

She said that it was a team effort to get things back up and running.

“We have our teams on site whenever critical systems are being upgraded or updated like they were today,” said Moseley.

“We have a lot of volunteers on site talking to passengers and helping out airlines. It really is a community approach.”

The airport said in a tweet it will be conducting an investigation into the network issues.