Originally Posted by
corporate-wage-slave
Thank you for amending your initial post to add in some specifics.
This is the thread you need to look at (and to summarise, BA takes the hardest line here, even on codeshares that land in their court) for baggage but these fares allow seat selection for most status passengers in most scenarios.
https://www.flyertalk.com/forum/brit...announced.html
and this is the chart you need (hat tip [MENTION=53393]ianwall[/MENTION] ). Just follow the zeros. The chart is poorly labelled, but in essence go down the first column on your marketing flight code airline. Then go left to find the operator / metal for your status.

The table could also be summarised as "avoid BA (either operating or marketing" at all cost! Unfortunately, of course, if BAEC, choosing BA has some advantages that the others don't but for checked luggage purposes, it is the worst possible option.