Some of these unidentified flying beings, those which resemble astronauts, or are more clearly humanoid, are mostly extraterrestrial. Some extraterrestrials take effort to remain unseen by intraphysical humans; others don't care (because they're well equipped technologically wise to handle any problems).
Some, particularly those which resemble pterosaurs or pterodactyls, come from the Inner Earth (
Aghartha). It's amazing that many people, allow themselves to be deluded by so-called 'science', are still unaware that the
Earth is hollow and is highly populated (by flora, fauna, and (genetically distinct from surface pple) human species).
The 3rd and last category, would be extraphysical beings (ie. from 'other dimensions') that under various energetic or electromagnetic conditions, appear visible to intraphysicals.
