The following exert is an eye witness statement. Please read into it what you will. This has been reported to mufon who I am sure are investigating:
It was about 2:30pm. i was just settling in to our camp site at the ymca campgrounds outside of the granby, co. area. it was partly cloudy skies, and had seen multiple passenger planes fly by over head. when i first noticed it i thought i was a large group of birds flying in nearly perfect v-formation. as i was about 20 seconds in to the observation i realized it certainly was not birds but one large aircraft. it made no sounds. from my vantage point which was almost 1’o clock view point in the sky it didn’t seem to be one solid color. i was either grey or tan as a base color with alternating dark spots or thick stripes. at the altitude it was flying it’s hard to be certain on color but it wasn’t one solid color for sure. i was also hard to see against the blue sky. with sunglasses on, i was able to see it well, but when i pulled my sunglasses down to see if i’d see it better it was actually harder to see. i watched it pass over head from right to left before it flew above a group of clouds and i didn’t see it come out the other end.
i’ve seen a ton of aircraft in the sky but never anything like this. and never anything that appeared so large at such a high altitude.
it made me more curious than anything so i tried to google images anything that might have a similar description and couldn’t find anything. it was pretty awesome! my assumption is military craft, but who knows??