I love seeing contrails in a brilliant blue sky. It brings thoughts of flying off to new places to experience new things. These "condensation trails" are formed when water vapor from the jet engine exhaust forms ice crystals. The altitudes at which the contrails form are usually between 25,000 to 40,000 feet - the altitudes at which airplanes cruise, as opposed to taking off and landing. There is something about seeing them that is poetic in some way, and which reaches deep inside me. If I see a plane flying overhead, I have to stand and watch until the plane is out of sight.
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