Have you ever seen an UFO? I bet you have. Yes, I have. In fact just yesterday I saw bird I couldn't identify and it flew away, so if UFO stands for Unidentified Flying Object, then that bird fits the description, right. So, anything you spot in the air that you don't know what it is, will fall into that classification. So, I would say that 99 percent of all sightings could have a rational, down to earth explanation but that one percent could really be an Unidentified Flying Object. And that one percent could also be something from earth. Below, is a chart of all the different types of UFOs that have been reported at one time or another:
Don't forget, you can click on pictures to enlarge them.
I had an uncle who lived next to the Allegheny River across and down river a bit from the little town of Foxburg, PA. He had a deck that over looked the river which he sat on a lot at night. He claims that he saw an UFO flying down the river, not more than a hundred feet above the river. And yes, he was a sane, logical, normal person.
I also found a lot more information on this internet site:
I found, on that site, where the origin of the title "flying saucers" came from:
"The modern UFO era began in 1947 when pilot Kenneth Arnold reported seeing nine disc-shaped objects flying over Mt. Rainer, Washington. A reporter labeled them “flying saucers,” and the term entered mainstream consciousness."
Now keep watching the sky, you never know what you may see, you hear?