I dont believe it is an aircraft as we know it. The reason is i don't see the profile of an aircraft (even at the camera angle in this example) which i would expect. Where is the "clear air" from the engine exhaust to the beginning of the contrail/chemtrail?
Now the "academics" say it's a contrail. I call BS on this. When they are smart enough to cure the common cold for example i may believe them.