I had a $600 credit on Northwest Airlines. Need to go to Los Angeles next week. Realized I could exchange that ticket for the $488 fare offered by DL for PDX>LAX. The flights are numbered as DL flights, but operated by AS.
I was able to get the AS record locator and add the flights to my trips page. However, when I wanted to waitlist for FC as a gold, I'm not allowed. Called the MVPG desk and they told me it could only be granted at the airport if space is available.
I thought I was so cool using this almost expired NWA credit... at least I'll get a free drink in coach. (unless MVPG gold recognition doesn't work on Delta tickets either).