”If every UFO report could be convincingly credited to some conventional astronomical or atmospheric phenomenon, there would be no UFO mystery. It is precisely because so many UFO reports
cannot logically be blamed on stars, planets, satellites, airplanes, balloons, etc., that a UFO mystery has existed since at least the mid-1940s.
The most convincing UFO reports were produced in the 1940s, 1950s and 1960s by airline pilots, military pilots and ex-military pilots. These men had the training and the experience to be able to distinguish between normal sky sights and highly abnormal sights. They knew what airplanes looked like, and what meteors looked like, having seen them many times. Their visual observations were frequently supported by radar data which showed essentially the same thing. They were therefore able, on many occasions, to methodically eliminate conventional phenomena from consideration when trying to identify UFOs.
In those same decades, most UFO sightings were made in the daytime and frequently at close range, when shapes and surface features could be distinguished, thus making positive identification of normal sights easier and the descriptions of unusual sights more detailed. When all normal explanations had been eliminated, the witnesses could concentrate on those aspects of the experience which were most abnormal.
These abnormal aspects included the shapes of UFOs and their behavior. Most of the UFOs seen in the daytime were said to have had simple geometric shapes--discs, ovals, spheres, cylinders--and surfaces that looked like metal. Such shapes are not only nonexistent among known aircraft, but contrary to all known theories of flight, in most cases offering control and performance disadvantages rather than advantages.
Even more unusual were the specifics of their flight performance: silent hovering, silent high-speed flight, extreme acceleration, supersonic flight at low altitude without sonic booms, and violent, very high-g maneuvers. The actions of many UFOs have suggested that they fly independently of the air and even of the force of gravity. The accomplishment of these maneuvers has been among the major goals of the world's aerospace industry for decades.
On the basis of their appearance, behavior and frequent well-kept, tight formation flights, we must face the possibility that some UFOs may be manufactured, high-tech vehicles…."---
Don Berliner, UFO researcher, author, FUFOR (Fund for UFO Research), “Is There a Case for UFO’s?”
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Peter Davenport, Director, NUFORC (National UFO Reporting Center) (Ronald Story, Encyclopedia)
“The proponents [of UFOs] offer up impressive quantities of principally eyewitness data, which although largely subjective and circumstantial in nature, is nevertheless quite intriguing…. Many of the high-quality sighting reports involve certain objective aspects, which, to an open-minded bystander, are quite impressive.
As a full-time, and serious-minded, UFO investigator, I strongly side with the proponents. It seems indisputable that the phenomenon is real, and that it falls outside the scope of “normal” human experience.
Strong evidence suggests that we are dealing with a phenomenon that is being caused by palpable, solid objects whose characteristics are not of human design, and whose behavior is suggestive of intelligent control.”
http://www.ufoevidence.org/NewSite/Papers/UFOQuotes.htm