Date of sighting: Aug 20, 2016, released Oct 2016
Location of sighting: Cologne, Germany
These UFOs appear to have an energy base, meaning that they don't appear solid and that the energy is contained in a small area. They move like alien drones, but they can be entities. There is a species of aliens that are energy beings, but they don't often mix with humans, since they have almost nothing in come with them. Its possible they are analysing the clouds for pollutants.
Scott C. Waring
Spanish News states:
August 20, 2016, Cologne Germany, Waldemar Czarnetzki recorded even luminous object reviewing a contrails of an aircraft or chemtrails as they are known, analyze the image and shows more cases where pede see these objects apparently reviewing the wakes left in the sky by aircraft ...