Southwest Airlines flights were grounded for just under an hour Friday morning due to software issues, an airline spokesman said.

The delays affected customers nationwide, including at BWI Marshall Airport.

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Southwest suspended operations for about 50 minutes as work was done on the airline’s software systems that were upgraded overnight, spokesman Chris Mainz said.

“We are working directly with our Customers who were impacted by average delays of 40 minutes in our earliest departing flights in the East,” Mainz said in a statement.

While no flights were canceled due to the outage, the airline has canceled about 80 flights today because of a weather system in the Denver area, as well as “a higher-than-average number of out of service aircraft.”

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