This article explains why the trails being left in the sky by large aircraft cannot possibly be condensation trails (“contrails”). Once this is understood, then we are left with the ominous question: “What do these trails consist of?”
High-bypass turbofan engines do not create condensation trails. The ratio of air-to-exhaust is much too high to facilitate the formation of condensation because the majority of air expelled from the back of the engine is not combusted. It is passed through the “fan” and simply blown out the back without mixing with any fuel at all.
In the video above, notice the large ratio between the bypass fan and the “core” part of the engine. *** Continue