"“Die Glocke,” a purported Nazi Germany UFO/time machine hybrid."
https://www.popularmechanics.com/military/research/a36560537/hitler-nazi-anti-gravity-machine-ufo-die-glocke-conspiracy-video/
"one physicist has a new theory … time travel."
https://mysteriousuniverse.org/2020/03/theoretical-physicist-claims-tic-tac-ufo-was-a-time-traveler/
"UFOs are man-made time machines, driven by human beings"
https://anomalien.com/time-travel-and-ufos-what-can-connect-them/
"Of all the theories and claims of what might be behind the UFO and alien question, the notion of time travel is perhaps one of the most intriguing. The idea that there is a connection between time-travel and what we currently consider alien visitation does itself branch off in several directions. And what’s more, it is one that appears more reasonable the more we explore the reasons for such claims."
https://www.ufoinsight.com/supernatural/time/ufos-time-travel
"He believes UFOs are time machines from the future.
Dr. Michael Masters, a biological anthropologist specializing in human evolutionary anatomy, archaeology, and biomedicine, suggests that people view UFOs largely the same way and uses his background to back up his controversial claim. “The phenomenon may be our own distant descendants coming back through time to study us in their own evolutionary past,” Masters said in an interview with Montana's KXLF.com."
https://www.foxnews.com/science/ufos-are-time-machines-from-the-future-professor-claims
"Corso gave much consideration to the idea that the Roswell UFO was a form of time machine, possibly even one designed and built by the denizens of an Earth of the distant future, rather than by the people of a far away solar-system."
https://mysteriousuniverse.org/2013/07/roswell-the-time-travel-theory/
"There is speculation that UFOs have shown up throughout history, going back to ancient times. Maybe humans keep coming back to observe or interfere with history. Perhaps even the supposed increase in sightings indicates that time travel becomes a tourism service."
https://www.reddit.com/r/UFOs/comments/2l64cv/what_if_ufos_arent_extraterrestrial_but_rather/
"WingMakers seem to represent themselves as a future aspect of the human race from a time approximately 750 years in our future. They represent a version of humanity that has comprehension of the universal systems that govern existence, or at least the laws of time and space. This understanding permits the WingMakers to travel back in time and interact with humankind at various points in its evolutionary pathway."
https://stillnessinthestorm.com/2019/04/the-wingmakers-a-future-aspect-of-the-human-species/