I asked this question in one of the few Delta threads on using SWU's on AF metal but went unanswered. So, here is my question for those of you out there who might know how to get the following accomplished.

I would like to use my SWU's to upgrade on AF metal. (JFK to ZAG)

As I understand things, the 'A' fare is no longer upradeable.

My question is this: how do you book, (or at least do a dummy booking) an S or W fare on AF.com? When I choose Premium Voyager as my booking class, it always comes up with the A fare and never shows you the S or W or gives you the option to be fare class specific, like delta, when booking the flight.