You seem to be suggesting that witnesses, such as professional pilots, design engineers, cops, and military personnel are not capable of distinguishing between a modern, man made aircraft, and an unidentified object...
***There is precedence for this. The same level of witnesses started reporting propellerless aircraft coming out of Germany at the end of WWII, and some that even seemed to be rocket powered. When we look at what the actual devices were and compare them to the eyewitness descriptions, the variance is astonishing. That needs to be taken into account when you study this phenomena.
Another thing that needs to be taken into account is how the authorities reacted. When bomber pilots reported seeing fast propellerless aircraft shooting down their buddies, they were told that they didn’t see that, and that if they talked about it they would get in trouble. Similar things happened to people who reported UFO sightings. Also, when a flying saucer lands, the typical engagement goes something like this: Saucer Occupant: “Get the *&*%@& out of here, this is none of your business.” Does that sound like an extraterrestrial encounter to you? How do they get such perfect profanity but don’t know how to say, “Take us to your leader”?
OK.