Did the guy have long hair and glasses? I sat beside a guy once on a DTW/MIA flight that had a bag that looked like this one and he had a bunch of Diamond tags on it (I figured he would be a real DYKWIA type but he was actually really friendly to both me and the FA)

I saw him a few months later on an LAX/DTW flight. They pulled a few people from coach up to first and he must have been on a higher fare ticket because I was pretty low down on the list and he had the same bag. I only remembered him because of the bag full of diamond tags.