The best evidence for UFOs as extraterrestrial in origin is based on high the high calibre witness categories.
The Batelle Institute Report from the 1950s confirmed the correlation that the better trained the observer the better and more accurate the reporting of the UFO report.
There have been over 3000 commercial pilot UFO reports. Many are corroborated by airborne radar, ground radar and multiple aircraft.
There have been over 2000 military pilot UFO reports. Many are corroborated by airborne radar, ground radar and multiple aircraft.
Many of these are truly spectacular encounters.
Many astronauts and cosmonauts have gone on the record outlining sightings during space missions.
NASA fails to comment on any of these sightings.
Hundreds of experienced radar operators have gone on record telling of the extraordinary movements and speeds recorded on radar.
Hundreds of trained observers trained in aircraft recognition have gone on record with confirmed unknown aerial objects moving with unknown flight characteristics.
Many noted scientists who have examined the best UFO cases become convinced that some UFO sightings are extraterrestrial in origin.
SENIOR MILITARY COMMANDERS
Many Admirals, Colonels, Generals etc have confirmed that UFOs are extraterrestrial in origin.
There are thousands of military witnesses -Army, Navy and Air Force - to UFO sightings.
There are thousands of police officer sightings reports from all around the world.
There are hundreds of confirmed well documented UFO landing trace cases from around the world.
There are hundreds of confirmed radar confirmed data records.
There are literally thousands and thousands of historical UFO related documents now in the public domain.