I just found the email request at delta.com, and sent a request in. Within 15 minutes, I had credit for the JNB/ATL flight. I didn't even try on the JNB/CPT because I don't know what the flight number was. I'm thrilled to get what I got, that one flight might get me Silver Medallion for the rest of the year (which will be great if we come up with another Delta flight; British Isles is on Continental).