New scramjet with test pilot? High speed...very stubby wings....at the right angle would look like a cylinder.....
“New scramjet with test pilot?”
A test pilot would be flying through a commercial aviation area?
I have no idea what it was. But, I know what it wasn’t: One of ours. Experimental military aircraft fly in very specific places, and times and altitudes positioned well from civilian aviation routes. They do this for a variety of reasons not the least of which is they don’t want to hit anything. Imagine the crap-storm if a civilian airliner was clipped by a Skunkworks plane.
I think a more reasonable and rational explanation in the absence of more detail is smugglers. That would also explain why it’s the FBI investigating and not the Air Force.