Since we don't know what UFOs are (that is what the U stands for!) it is wrong of us to assume they are any kind of craft, flying or otherwise. There are plenty of known phenomena that can look like UFOs zipping around, that are not piloted alien craft. So there is no logical need to reason to assume they are alien craft.
While it is both easy and fun to make up technobabble about how alien spacecraft operate, it is just words. If anyone knew, for real, how they worked, they'd build a copy and sell it for a fortune. But this question is not about alien spacecraft-- read the question! It is about UFOs, and never, not even once, has any UFO turned out to be an alien spacecraft, In fact, aliens are not yet known and proven to exist.
Since UFO stands for Unidentified Flying Object, yes, UFOs can fly.
It is impossible to even speculate. There is no admitted proof that UFOs do exist and no hard information on propulsion.
Where humans and alcohol are, UFOs will be.
the correct answer is UFOs thanks for asking
There have been reports of sightings of white UFOs.
The ones who study UFOs are called Ufologist. They study every thing about unidentified flying objects (UFOs).
Please check the related links for information about UFOs.
Since UFOs are unidentified, it is unknown what is inside of them.
UFOs can go as high as your imagination allows.
No, UFOs are not technically extinct, they are just rare to see.
People have reported sightings of UFOs in France, but there is no proof of their existence.
The African Origins of UFOs was created in 2006.