Originally Posted by KSVVZ2015

Exactly. And that is far more plentiful on BA vs. US carriers. But remember you will also get wacked with the carrier surcharge which is even higher on US-originating tickets.

Point is - if you want to be in a J all the time without paying for it but are willing to be a decent amount for W + YQ - BA has its advantages. If you want cheap upgrades but are willing to fly Y and W some of the time when you don't clear, UA is better.