There are three reasons why it is a UFO:
1. It is unidentified,
2. It is flying (or, at least, it’s in the air), and
3. It is an object.
Case closed.
Case closed.
Maybe! A few years ago I remember seeing (on a TV show) someone who got film of a bright rhombus-like shaped UFO darting as t astronomical speeds across the sky. They and everyone else was POSITIVE it was proof of a UFO especially when a few months later someone else on the other side of the globe caught footage of the exact same UFO. But ... upon further investigation it was revealed that they were both using the same model camera and were chasing rare light glints in the camera. Usually the simple explanations are the best explanations.