Just wondering...

so I live by an airport and im wondering why when theres an airplane it leaves behind the white line in the sky?

Contrails (short for condensation trails) or vapour trails are visible trails of condensed water vapour made by the exhaust of aircraft engines. As the hot exhaust gases cool in the surrounding air they may precipitate a cloud of microscopic water droplets. If the air is cold enough, this trail will comprise tiny ice crystals.

its moving around gas.. ya know.. like clouds are made up of gas and other shytt or sumthing lilke that

it's an artifical cloud certain plains are made to do this if you have time sit there and watch it will spread

its becuase of the chemicals the planes realeas or its in a drag.
just like our cars the realease the gass out of the muffler a plane does the same just there is a lot more of it.

its chemtrails look up chemtrails and the New World Order on youtube and you will see what its all about...