Artificial Planes

You know how sometimes you'll see planes flying over your house, town, city? But they don't look like planes? They look like UFO's, or shooting stars. But, of course, they're planes, regular planes. Or are they? What if I told you each planet is colonized? Yet we are all humans? Of course, we all have different characteristics and abilities. Of course, none of the planets know this. Or maybe, we are just late to discover this.
These "planes" are just their way of watching over us, without us catching on.