I myself have seen a plane hovering still in mid-air. I have friends and family who have also seen it. (Just like black chemtrails) So, cgi is out of the equation. There are only 2 other possibilities. 1, they are holograms. Unlikely, but sure, possible. And 2, they are glitches in the Matrix (Earth). I don't know how, or why. All i know is there's much more to this world than the physical that we know..