Silent Fuselage

On Sept. 2nd, 2017 I was camping with some family members on my property located in Indianola, Utah. At about 7:00 pm I was setting in front of my brother in-law’s trailer along with my wife, sister, and brother in-law. I was looking to the south and saw what I first thought was a small jetliner sized plane (50 passenger) moving from the southwest to northeast in a shallow curve to the east. It was flying parallel to a mountain ridge that is south of my property and was at an altitude of about 1000 feet above the ridge. The object was flying flat and level at about the speed of a small private plane.
The object looked like the fuselage of a small jetliner, and was silver in color, having what looked like window in the front but no windows along the sides. The odd thing about it was that I could not see wings or tail section on the fuselage. It had a rounded front and end. It was about 1.5 miles from my location.
I then noticed that there was no sound from the engines. My brother in-law said he could barely hear something but I could hear nothing. Something that large should have made a lot of noise to stay in the air. By the time I was able to get a pair of binoculars and get them adjusted I only caught a glimpse of the object before the mountain obscured the view. Through the binoculars I saw some red toward the rear of the fuselage which may have be a reflection of the evening sun. It could have been a very large balloon, but blimps have engines that can be heard and it didn’t look like a blimp. If it was a free floating balloon then it was a very large one and its altitude would change as it passed over the ridge but its altitude was always the same. I really don’t know what it was.
Roger O.