Photos: Staying cool no simple task in West heat wave

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West Heat Wave
A jet takes off from Sky Harbor International Airport, Friday, June 28, 2013 in Phoenix. Airlines are monitoring the soaring temperatures to make sure it's safe to fly as excessive heat engulfs much of the Desert Southwest. The heat presented problems for airlines because extreme temperatures make it difficult for smaller planes to lift off. When the air gets so hot, it becomes less dense, almost replicating thin mountain air, requiring longer runways and less fuel in the tanks to assist with takeoff. Officials said big jetliners function fine in the heat, but smaller regional carriers may have delays because of the weather. (AP Photo/Matt York)