OK, closest thread I can find.

I am looking PHI-SFO next month sometime. Delta shows only connections, however Virgin has direct flights. So I'm thinking its on a partner, but is it a codeshare and does that matter?

So..... basic question can I book on Virgin, but choose to accumulate skymiles vs whatever Virgin uses?

If it does work does Delta gold get me anything on Virgin in terms of upgrade status (I assume main cabin select=delta comfort?)