Tried to SDC this week on a first class ticket. As usual the website didn't work, and only offered only a few choices for an additional $1,300. The Diamond line and a supervisor declined to process the change I requested because 1) it wasn't within 24 hours (it actually was), and then 2) because the fare class wasn't available (which shouldn't matter). The computer was blocking it for both of these reasons, and the supervisor declined to override until I read the agent the language verbatim from the website. Score one for Delta IT and SLCRES. SDC shouldn't be this painful.