Loveland, Colorado. Reported in Dec. 2013 but occurred on 7/27/2012.
His attention to the unknown object was drawn to two unusual characteristics: the extremely slow speed (he expected a stall) and the lack of observable wings or tail. Further, what appeared to be windows within a blue stripe on the object, were larger and more rectangular than typically observed on commercial aircraft.
The witness's report is as follows:
"As I was walking out to my car I happened to look up to the west and saw what I assumed was a jetliner, but it was going really slow. I kept looking up at it thinking that plane is going to stall out and crash because I didn't hear anything; it was completely silent. It was headed directly toward Denver International Airport as so many planes do like it was making its final approach. But then I was thinking to myself, 'that doesn't look right'. I had aircraft identification in Civil Air Patrol and could not see any wings or engines. But I thought maybe I'm seeing it at a bad angle and if I keep watching it I'll see a wing or engine; the whole time thinking it's going too slow. Then I noticed this thing doesn't even have a tail, there was no tail or stabilizer. I kept walking to my car and looking up at it every few seconds. I got in my car and as the car was warming up, I watched it more intently and noticed the windows running the length of the fuselage were bigger than a passenger plane has. They were more rectangular and bigger than planes have. I had not noticed it sooner because there was a dark blue thick stripe running down the length of the middle of the fuselage. Above and below the blue stripe the rest of the fuselage was metallic like a lot of planes. That's why I didn't really notice at first this thing didn't have wings or engines because of the blue stripe.
See also - Case #52339: Adel, Georgia. Nov. 19, 2013. 6:20pm
I’ve Seen Through The Looking Glass, Outside The Fishbowl