This is a great article about some of the things most often identified as a UFO. While I’m pretty-much a UFO believer, it’s also obvious that many things mistaken for them are not. We saw an Iridium flare last night at a star party as well as three meteor shower fireballs. Clearly they were NOT a UFO!
Most Unidentified Flying Objects aren’t unidentified at all. Here’s a list of natural and human-made objects in the sky that people frequently mistake for UFOs.
Source: If it’s not a UFO, what is it?