Originally Posted by
COpltASgldPHX
You need to read the ENTIRE thread again, Mothura. What was being offered in this case was an F seat at the paid F fare. The difference between what the OP paid for the segment and the price of paid F was calculated and presented @OLCI as an option. That option was always available, it was just presented at OLCI as an enticement to spend more $$ for a confirmed seat in F. It is NOT the same as a same-day paid upgrade which is only offered after all elites have cleared into F.
Plus this is available before checking-in as well. If you view a reservation, the bottom of the page has a buy-up to a refundable fare and to first class. The cost is the fare difference.