yes, it is likely that many sightings are actually of human made vehicles. check out the sirius project's presentation on the 'cosmic false flag' for how they allege a long term plan to use the tech to create a fake human/alien war to take over from the 'war on terror'! https://www.ureka.org/videos/watch/86996/the-cosmic-false-flag-a-presentation-by-dr-steven-greer