I too also saw something that I cannot explain. This too occur in flight coming back to the US from Mexico. I was enjoy the view of these pretty clouds and how white and puffy they were. Then suddenly, among the white clouds, I saw like a Grayish, metallic looking round object. It look like it was riding along with us, so I immediately turned to my mother and told her to look but when I looked out it was gone. I can not say for sure if it was a UFO, or perhaps something that the clouds did, I don’t know. It did stand out among the clouds. I didn’t get scared but just curious - what did I just saw?
We are all curious about such things.
I had a good friend who lived out in the country and saw strange lights and craft at night in this little valley he lived in. He talked about this often and was curious about this until the last week of his life. He told me that the first thing he was going to do after he passed was to ask about what he really saw. My wife had a dream soon after his death. He spoke to her in this dream and said “Tell your husband I know what it was.” She asked what it was and he said,”You’ll find out like I found out.” He always was kinda of a jokester.