While I know there have been reports, in 16yrs I’ve been flying professionally I’ve never seen a UFO nor have I met anyone who has. Not saying there aren’t any but I can tell you sightings are not very common.
I will however share a story. About a year ago I was doing a very early morning flight to KOA. The sun hadn’t come up and it was a very beautiful dark sky with no moon. I was looking up when I saw this bright “train” of lights moving quickly but steadily across the sky. There were quite a few (I was thinking 50ish) perfectly spaced in a perfect straight line and clearly in space. I’m not going to lie, I was more than a little freaked out. Honestly I’ve always been somewhat skeptical but all that went out the window. Both myself and my FO were in shock an I said “holy moly, I guess I’ve been wrong all this time and the world as we know it is about to change”. Time to call my kids and tell them I love them!
After we landed I quickly Googled “train of lights in the sky” thinking others surely saw this and I was in fact correct. Many had seen it BUT it was not an alien invasion it was a string of 60 satellites launched by SpaceX called Starlink. Not sure if I was disappointed or relieved but if you ever want to see something REALLY cool Google where to see it. Might not be ET but def worth a look.