lol, but that's not the case here, or in most others cases, as these objects are definitely aerial, moving, flying etc. They're splitting hairs to avoid stigmas, to be PC etc.
Think illegal alien, but now it's undocumented alien or whatever their last term is.
UFO is probably the perfect term. They're unidentified, they're aerial or flying, and they clearly appear to be some type of objects.
You asked what the difference was. Not was THIS was. Jeez….