Originally Posted by
clubeurope
they got rid of the agreement to check through luggage to other partners on separate tickets a few years ago. Even BA wouldn't check through luggage on BA-BA connections (on separate PNRs).
Anyways, being in an alliance doesn't mean that they'll necessarily check through your luggage. It's not a written benefit. And as plunet has mentioned, it is wholly under the discretion of the check-in agent.
I wasn’t referring to any of that you mentioned. Only to the fact that an alliance has an inherent interlining agreement between its partners.
So goes without saying about codeshare partners.