Fess up...You don't even know what a contrail is, do you?



Come back when you educate yourself a bit Spanky...

""Contrails or vapour trails are condensation trails and artificial cirrus clouds made by the exhaust of aircraft engines or wingtip vortices which precipitate a stream of tiny ice crystals in moist, frigid upper air. They are not air pollution, though they might be considered visual pollution.""

[link to en.wikipedia.org]

Read a friggin book once in a while...