Here’s a page full of propeller-driven airplanes causing contrails.
During WWII.
https://www.google.cz/search?q=ww2+contrails&client=ubuntu&hs=poG&channel=fs&source=lnms&tbm=isch&sa=X&ei=EPczVezaMI_haODsgNAK&ved=0CAcQ_AUoAQ&biw=1297&bih=639
Those pictures were faked by the aliens. It’s been proven.