Thanks ashill...

I have a 2 LAX-SEA round trip, one booked on AS and one on VX, both in Y. And I may have a few more later.

The Y mile earning doesn't concern me much but I definitely care about earning AA EQM and EQD, plus potentially able to check bags for free.

The AS reservation was made with my AA# (Platinum) so I should be good with priority boarding and seat assignment and bag check.

The VX reservation was made with my VX# (not elite status) but I've already converted my VX miles to AS miles so I may change that to my AS#. But sounds like I will be out of luck on priority boarding, seat assignment or bag check.