A large floating object in a sphere shape, and full of light traveling next to my plane for 2 hours.

I was traveling from New York to Boulder Colorado the night of April 2nd. The plane got up in the sky and I looked out the window and saw this object but I thought maybe it’s just a reflection of light and didn’t think much of it. I went to sleep and woke up an hour and half later and it was still there but moved to a better place where I could see it. I spend an hour watching it trying to figure out what it was. It was not a plane, not a star or the moon, and then it started to change color to be a red/orange. Near the end of my flight I looked down and then up again and it was gone I couldn’t locate it again. I took images and videos.