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The opposite is also true â¦. Generally, as temperature increases, a planeâs power and performance decreases. As air heats up, it expands and becomes less dense, or thinner, just like air at higher altitudes. So on a hot summer day, a planeâs engine is taking in air that is less dense, with less oxygen.
So what causes a trail? Jet planes fly at very high altitudes, often at 26,000 feet above sea level or more. At these heights the air is very cold, -40oC or less. As a jet plane flies at this height, it releases hot water vapour and carbon dioxide from its engines.