Basically, your question was how does AC codeshare K map on to TK metal? Well, based on how it posts on AE, you could probably figure out how it will map on to TK.

This chart kinda does that. K is the lowest on AC's chart which gives zero, so I would make the assumption that the lowest fare class on A3's chart gives zero.

But hey, if you disagree that's fine. You can tell us how it all works out afterwards.