No..all those known things have been ruled out, hence meriting it the name UFO. Do I need to start quoting those UFO definitions again?
"An unidentified flying object, or UFO, in its most general definition, is any apparent anomaly in the sky that is not identifiable as a known object or phenomenon."---https://en.wikipedia.org/wiki/Unidentified_flying_object
Here's the difference in how a ufologist uses the term UFO and a skeptic uses it. For a skeptic an object is a ufo before the investigation of it and could be anything. For a ufologist an object is a ufo only AFTER the investigation, after all known causes have been eliminated. At that point it becomes a true unknown and unidentified object, matching thousands of other sightings of such mysterious anomalies.
MR.
The key is investigation ; of which almost none do. Except us few .