I was on SFO-IAH 12:40am flight on Sun. I did not get upgraded until 20 in before takeoff. Ticket was a "V" and I'm Gold. The back was completely full and I was check in seq# 74. I thought no way was I going to get the upgrade. However I did, thankfully. The passenger next to me was upgraded becuase the entire back was full, she had no status. My question is what exactly does the sequence number mean? I thought I was only for elites however is it for anyone doing OLCI- status or not?