At Denver International Airport in Denver, Colorado, a row of United Airlines passenger planes are parked at gates. Getty Images/Robert Alexander On Wednesday, a power failure at Denver International Airport caused aircraft delays. United Airlines and Frontier Airlines both have important hubs at the airport, and Southwest Airlines also has a significant presence. The airport is working with Xcel Energy on the issue, according to a representative for the airport. The cause was unknown at the time, and Xcel Energy declined to comment. In a tweet, the airport advised travelers to check with their airline for any changes. According to an airport spokesman, security screening areas and trains to gates are still operational. Hundreds of flights at the Delta Air Lines hub were affected by an hour-long power outage at Hartsfield-Jackson Atlanta International Airport in December 2017./n
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