How do you explain pilots reporting this phenomena before modern radar systems and technology? These crafts have been reported for decades going back all the way to WWII and before.
Did you read Project Blue Book? Quite often the events reported by pilots had quite benign explanations. Laymen often attribute extra qualities to pilots, especially military pilots, when there's no reason to. Just like everyone else, pilots can be drunks, crazy, racist, paranoid, or pretty damn uneducated. And they're not ideal observers because they usually have a ton of other shyt they have to be paying attention to when they're in the air and they can be prone to paranoia while they're up do to the very real shyt they have to worry about. I grew up with two guys who became military pilots - one flirted with QANON for a period of time and has psychological issues including extreme anxiety that forced him to give up his pilot slot, and the other was a juvenile delinquent who did poorly in school and has never taken a college course in his life. There's no reason to think that pilots are any sort of amazing, accurate, objective observers any more than anyone else.
And as I already pointed out, it's telling that the things we see on the sensor equipment don't match the observations. For decades the MAIN report we heard from pilots was "flying saucers". Yet not one of the sensors is showing a flying saucer. Y'all just juelz that away because you're uncomfortable with the fact that the images built by the power of suggestion in the human mind don't match the images built by pixels on a screen.