Simviation Forums

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

The contrails form individually, as they're left behind, the cloud expands and merges.

How high does the plane have to be on an average day? I am thinking of FS2002.
Dan

30,000 feet on an average day, maybe 32,000.