Chrome, oblong shape that moved incredibly quickly, south of air show.

I am an extremely avid aviation and space enthusiast and have been for more than 20 years. I know about, or know of, probably most aircraft in existence whether they're blimps or dirigibles, drones, helicopters, airplanes, even rockets and satellites.
On the weekend of October 16th and 17th, 2021, the Northern Colorado Regional Airport had an airshow, which included the Blue Angels. Living on Audubon Ct (80528), I was ~1.5-2 miles Northeast of the airport, and had a spectacular and uninterrupted view of the entire horizon to the south. From my roof on Audubon Ct (I have since moved), I watched, also using binoculars, the entire airshow from start to finish on both days.
Sometime in the afternoon on what I believe was Saturday, Oct 16th and probably around 1400 hours, there were stunt planes demonstrating their performance. As I watched with binoculars, there was a reflection due south of the airport, probably 10-20 miles away and at an altitude between 1,000 and 5,000 feet (using the Foothills and mountains as a reference). I focused the binoculars and saw a very clear and distinct chrome, oblong object. It was completely stationary for 2-3 seconds, almost as if it was observing the airport and airshow. In a split second, it disappeared. I lowered my binoculars and, with the naked-eye, I saw the reflection again, raised my binoculars and saw it had reappeared significantly farther south and slightly to the west, where it, again, remained stationary for about 5 seconds, before completely vanishing upward. It was only 1 or 2 seconds between when it initially disappeared and reappeared. There was only the one craft, and there were no visible lights or trails, only the reflection of the sun coming off the object (it was very clearly some kind object with how it behaved).
Because of the airshow, the airspace around the airport was, of course, very restricted and there were no other aircraft visible to the south during the airshows hours, especially during a performance.
I tend to think of myself as being a logical person with a vast knowledge of aircraft and spacecraft, but what I saw that day defies everything I know, not to mention the actual physics behind it. I have quite a few friends and family in the aerospace industry, as well as the Airforce, and when I explained it to them, they had no explanation into what it could've been or how it did what it did.
For the last 2 years, I have been grappling with what I saw and doubting myself, especially since I didn't see anyone else mention this on social media afterwards. However, in light of recent UAP/UFO information coming out from the DOD, I thought it prudent to submit this report in case it corroborates any other possible sightings of something similar that weekend.