Originally Posted by
drowelf
Really, I don't think thats true. When ever I'm number #1 or even #2 on the UG list, I monitor the UG list via my BB after boarding. Several times I've seen that I've been upgraded after boarding, generally at about the 10-15 minute mark before departure. The GA then finds me packing up my stuff in anticipation of the move to the Front part of the plane.
No, it's not true at all. As mentioned by others, except on DL, there is no basis for this idea whatsoever.