Chevron over Colorado (southeast part), CO

The report, as filed

From around 34,000 feet, I noticed in a completely clear sky a chevron shaped object. It was dark grey. There were no clouds anywhere, and no other objects in the sky. We began our descent into Denver. I estimate when I noticed it it was around 30,000 feet. I believe it was moving the same direction we were only slightly slower. It appeared as a V. As we descended, it flatted out in my perception and was completely flat and extremely thin. I witnessed a fast moving plane come in to my sight. It seemed to have a wider jet trail that was angled more like a "V," instead of a "=" stream. The plane came in fast. I couldn't make out what type of jet it was but it flew towards the object and made a quick turn around. I could tell because of it's jet stream it was going towards the craft and then parallel with the craft. It was above and to the side of the V shaped object. It remained over the object until it was out of my vision. On Southwest flight. This was probably somewhere in that New Mexico/North Texas/Southest Colorado area. ((ADDENDUM FROM WITNESS)) Seemed more of a darker gray, more black. That's why it stuck out. On the smaller her I couldn't tell. It was fast and made what looked like a a power slide maneuver when it got over top. Once over top it seemed to do more of a hover/drift rather than fly. So I don't think it was a commercial type jet. I don't think those hover planes can do that maneuver that high in the air, but that's what it looked like. Yes, it looked like it "wing manned" it or was guiding it away. I'm not on crew. I asked one pilot, "What the hell was that, and he just looked at me and said, "I didn't see anything." ((END ADDENDUM))

Held as-reported from National UFO Reporting Center (record NUFORC #133515). Witness text is preserved verbatim, including its spelling; nothing is edited beyond formatting.