I appreciate the answers so far. Much to my surprise my tus-sea-lax-tus trip ended up with fare class V for tus-sea, fare class L for sea-lax, and fare class S for lax-tus (AA flight but can't tell if I'm booked on the prime flight or the AS codeshare).. AA says that I will get loyalty points based on fare class and distance. This trip will not make or break my next elite status so I will just ride this one out. This was all booked on the alaska website. I did try to piece this together using expertflyer after I posted my original question. I discovered I could not find fare class S for lax-tus on either alaska or american via expertflyer.

Thanks again!