It’s not really behaving like a drone, though - too fast, no heat (i.e. no engines), staying in the air all day (in the sense that every time they look for it, there it is), invisible, etc.
Well, first of all, the “objects” only started showing up when they changed the sensors on the planes. Second, they initially only showed up on radar but were otherwise invisible. Eventually someone started “seeing” them on their infrared camera, but not by eye or other cameras, where they still remained mysteriously invisible. (Eventually someone claimed to have seen one, with their eyes, briefly, but the description doesn’t match what was seen on the infrared camera.)
This sounds an awful lot like what’s happened in previous “UFO” cases - someone sees a radar glitch and goes to check it out. Once there, primed to see something, they inevitably do, even if there’s nothing to see. They end up mistaking something innocuous like the planet Venus or some reflected light for an aircraft. (Which seems to move impossibly fast because they’re mistaking it for something at a particular range, where it isn’t.) You’d think pilots would be able to distinguish things they see on a regular basis, but the brain doesn’t work like that. (In at least one documented case, a pilot was convinced they were being followed… by the fucking Moon.) In this case, the “object” is oval shaped like, say, a drop of water or small out-of-focus bit of debris or light leak inside a camera (whose shifting could easily be interpreted as “spinning”).
So… yeah. I’d really like to think it was some super-tech drone, flying saucer, or weird physical phenomenon that will expand our understanding of the natural world. (Fingers crossed that one of those is true!) But, based on past events and inconsistencies in these accounts, most likely it’s sensor flaws that took on significance because pilots were expecting to find something.
Sadly, possibly not. If it’s a mirage caused by a flaw in the system, we’d learn two things: to keep dust or condensation (or whatever) out of cameras, and that people see things when they’re primed to do so. Sadly, neither of those bits of knowledge is new. This is why, after a lifetime of following UFO stories, I find most of them incredibly disappointing. Collectively they’ve already told us quite a lot about human perception and self-delusion, a few uncovered some interesting natural phenomena, some told us about human psychology, fantasy lives, fraud, etc. but most just reminded us how bad we are at accurately perceiving what’s around us.
When it comes to sightings of UFOs or cryptids, I always think of an incident reported by some biologists who were in a region where people believed in mermaids but there were also dugongs in the local waters. One day a fisherman comes to the village, excited - he was just out nearby and he’s seen a mermaid! The biologists, skeptical, ask if it wasn’t, perhaps, a dugong. No, he says, he knows what a damn dugong looks like, this was definitely no dugong, this was a mermaid, and moreover he can prove it. So he takes them out to see it and, of course, it’s a fucking dugong. Not even a weird one or anything. A regular dugong, that, due to whatever circumstances when he initially saw it, seemed like something amazing.