Val, thanks for the comment about my avatar. Won't be long before I'm back in that swamp waiting for daybreak. Peaceful way to start a new day.
I think Greg must be right. The black background tricks my brain into thinking the colors are richer and more saturated than on the FAA white background. As to any other how and why they look different, I don't know but when I look at the first page of images on both sites, I see a marked difference. I thought that maybe since the thumbs are significantly smaller on the AW site, the pixels were bunched closer together, thus giving the illusion of more saturated colors. The colors look totally washed out on the FAA side.
OK Richard, would you like to randomly choose images and visually compare them?