Some of the UFO footage, if it were physical objects, break basic rules we have of how air works. Do whatever you want but if you move thru air fast enough you will get a plasma. And yet we don't see that.
So either physics is broken or those objects are sensor figments. I am going to assume physics still works.
Sensor glitches, reflections on cockpit glass, small close up things that seem far away and large. There are so many explanations that make more sense than physics defying aliens that are naturally blurry.