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Contrails are created under certain atmospheric conditions and depends on the pressures and water vapor. They are created from wing tips or propeller tips and engine exhausts. Each airplane varies in their design of these features. Many modern airplanes have wings designed with supercritcal airfoils that produce more lift---and therefore developes a lower air pressure. Some jet fighters also have special designed wings and wing tips that will create contrails in a tight turn that earlier aircraft could not perform. Thus the F-18 can fly very low and still produce contrails. There are many factors that contribute to the contrails so there is no way to predict which aircraft will produce one.

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