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The outage began at about 1 p.m. in Terminal 1, which handles domestic and international flights for all airlines except Southwest Airlines, Barnes said.
The airport was forced to stop screening passengers at security checkpoints, and airlines were unable to provide tickets to passengers or board them onto planes, Barnes said.
"Essentially, things just came to a stop until we were able to investigate the situation and get it resolved," Barnes said.
Power was restored at about 1:20 p.m. Barnes did not immediately know whether any flights were delayed.
The cause of the outage is under investigation, she said.
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