I have a connecting itinerary coming with up two NW-coded flights. The first flight is operated by CO as a NW flight number, the second is operated by NW. The ticket was purchased on nwa.com.

At this point I would prefer a later flight on the same day. There is a NW-operated flight that I would prefer, and it is likely to have seats available. It's not so important that I would pay the ~ $500 change fee, but I would gladly pay the $25 FlyNow fee.

Now, I understand that I can't check in online at nwa.com because the first flight is not operated by NW. But will I be able to FlyNow to change to the later NW-operated flight?