Originally Posted by chicago_steve
Can you do cash upgrades ... as you can on United (i.e. if business or first is not full, United will allow premier members to upgrade for cash, usually in the area of $350 or so).
I did such a UA cash upgrade last year. When I flew UA earlier this year and asked about this, in both directions they told me it was a prior limited promotion and no longer available (SFO-FRA-SFO).