I've seen aerial craft myself, captured video, represented international professional research organizations comprised of retired NASA aerospace engineers, and nuclear physicists. The evidence in their archives would stand up in any court of law, much of which comes from depositions of first responders, military personnel and pilots from the US and other countries, as well as many commercial airline pilots.
In May 2001, Dr. Steven Greer held a press conference at the National Press Club in Washington, D.C. that featured 20 retired Air Force, Federal Aviation Administration and intelligence officers. According to a 2002 report in the Oregon Daily Emerald, Greer has gathered 120 hours of testimony from civilians and various government and military officials, including astronaut Gordon Cooper and a brigadier general, on the topic of UFOs.
A basic concept of logic: When we as a species globally observe craft that out-perform our best technology and push the boundaries of the physical forces a human can withstand, all without visible means of propulsion, wings, or typical human aeronautical design, we can reasonably state that "humans of our time did not build these craft". Therefore, we should then ask the question, "from where did these craft/objects originate?"
Also, the US Navy just released gun camera footage of F18 fighter jets that tracked unknown flying objects....this was released this year and is the real deal! Pilots are finally going on the record, this is huge! Pilots were always strongly discouraged and threatened if they went public. https://www.cnn.com/videos/us/2019/05/29/pilots-speak-out-on-ufo-sightings-jeanne-moos-ebof-vpx.cnn
Also, check out: https://www.mufon.com