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Link: https://www.rt.com/usa/393210-phoenix-flights-cancelled-heat/
As temperatures soar in Phoenix, Arizona, planes are being grounded by American Airlines over concerns they can’t operate in the high heat. Nearly 50 flights have been canceled as temperatures exceed the airline’s maximum operating temperature. Extreme heat can affect a plane’s take-off, with warmer air, less dense than cooler air, generating less lift. Planes require more speed to take off in these conditions, along with more fuel and longer runways to generate the lift.