if anyone has seen this behavior before please reply here, i have not ever seen this before personally, nor have i ever found other eyewitness descriptions of this.. If this could be documented on high quality video it would be the all time proof to the skeptics that what these aircraft are leaving in the sky are in fact NOT normal contrails, after all, do jet planes use 2 different fuels on each engine? do they have engines that dont match? I HIGHLY doubt it... do the atmospheric conditions vary from one side of the plane to the other? I doubt that too.