<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by Swiss Tony:
On the same point, what fare bucket do the upgrades to J come out of, and is there any way to check availability?</font>
Just keep calling UA until you get an agent who will tell you how many pax are waitlisted for upgrades ahead of you.
The best way to check availability is per
Ozstamps' thread where he outlines in detail everything. The most comprehensive report on breaking down fare classes that I have ever seen.
It's in UA forum not too far away.