I was on my deck when I looked up and saw this object flying across the sky.

I was standing on my deck when I noticed the object moving across the Sky at a high rate of speed. It was white and shaped like a TikTak or a small pill but it was moving so fast that it traversed the sky in a incredibly short amount of time. It was highly lit by the sun and appeared white with a small depression towards the center kinda like a pill. It was move upwards and south west. There was a noticeable agitation or discoloration to the air immediately surrounding the craft and it was kind of Gray and appearance against the rest of the very very blue sky. Immediately after a plane flew low in the horizon and I live near Stewart Air Force base was a commercial passenger plane coming from the South and look nothing like the craft actually it was quite dark against the sky at the height it was in the atmosphere. I have a video although my hands shake pretty bad of the craft shooting across the sky And my surprise as I hold a science BA and have never seen any UAP in person. My dog also noticed it initially.