Originally Posted by
RobOnLI
... Yes, United closed the buy-up loophole. If $300 is a buy-up and not a re-fare then you will not be able to use PlusPoints to get into Polaris. However, if you do a re-fare and flat out pay for PremPlus (O/A/R) then you can absolutely apply PlusPoints.....
Recently (past few days) experience suggests the loophole is still there. A 1K friend was in economy (PlusPoints applied) and I was in paid PremPlus (MUA for Polaris), Polaris was full, but PremPlus had space. At the Gate, the 1K was moved to PremPlus (seat next to me!) and moved ahead of me for Polaris -- which did not matter as Polaris was full but clearly showing the loophole is still there.