SFO-JFK is $220 for this weekend, so I went ahead and booked -- only catch is that I wanted to use a PK227 (a NWA $25 off cert). nwa.com wouldn't let me use this with the Delta flights, so I called up the elite line and they managed to make it work. Sadly, the reservation has NW-coded flight numbers, and when I look on delta.com it says "Not Eligible" for upgrades. The agent on the phone said the upgrades would be processed by the NW system, I'm a bit dubious. Does anyone have any experiences post 1/4 with NW-coded DL-op flights and upgrades, and any idea on if I need to somehow need to have anything done manually?

(1/16 Flight: NW 9168/*DL 72 and 1/18 Flight: NW 8962/*DL 719 -- both showing no upgrade availability, expect something might open up tomorrow or friday, but want to make sure I'm on the list.)