I asked someone at Global Travel this question a few weeks back and they said they were pretty sure we could get the miles on Delta since the NWA/DAL merger went through. I don't know on what authority this comment was made, but I would feel more comfortable knowing the message came from someone who wouldn't punish us if we did wrong.
On a side note, I knew someone who commuted from the Houston area and used Continental for most of their travel. They would attach their NWA FF number to the ticket since CAL has a code share with NWA. I'm thinking that since it wasn't a NWA ticket they can't do this. Anyone know if this is legit?