YouTube channels
NARCAP
A source for videos related to aviation safety-related incidents and observations involving Unidentified Aerial Phenomena, UAP. NARCAP has been documenting and researching aviation-safety related incidents involving UAP since 1999. NARCAP defined and established the term UAP. NARCAP has been advocating for further research and education inside the aviation community to acknowledge and mitigate risks arising from UAP for over twenty years.
See more (external link) 
https://www.youtube.com/channel/UC9gtU_teKHPr09Ybdj4Md4A