Source: Global Skywatch 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?" You can see the video version of this article here. NOTE: This article has … Continue reading Why High Bypass Turbofan Jet Engines Are Almost Incapable Of Producing Condensation Trails