Ok this may seem very simple to ya'll but im not an expert so here goes! Ever since i was young ive looked up at planes if i hear them or see them all of my freinds think im strange but ive got one question..............It is visible on all planes on a clear day to haw may engines they hav judgin by the contrails so how come i can see planes with one single contrail coming from the back a fair bit behind the plane? Any help appreciatied!
Born_2_fly ;D
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