Was watching the upgrade list closely before boarding last night on a flight from SEA-ANC as there were 2 open FC seats and my wife and I were number 2 and 3 on the list. I usually watch the standby list as well to get an idea of how many of the empty seats will be filled from standby passengers. Before boarding the FC open seats went from 2 down to one. I quickly looked at standby list and realized one seat taken in first was from the standby list. How can someone go from the standby list to FC??

I did approach the podium and asked the agent about this and her answer was completely vague, However the next time i looked at the standby list the person moved to first was no longer listed.

Strange