Originally Posted by
DLroads
If you are trying Y, I presume you attempted to book a TATL on AF/KL. My suggestion would be:
(a) search the days you want on airfrance.us (even if it is a KL flight) in the lowest coach available, using the flexible dates option.
(b) airfrance.us will show you the potential flight combinations (outbound and return.
Unfortunately, af.us doesn't recognize YHZ as a possible destination. I needed an OJ: LHR-YHZ//OMA-LHR with the outbound in cheapest coach and the return in PV to upgrade.
As far as I recall, indeed you cannot price W and T, but you should be able to price S and T (S moves to J class with SWU). A will price but is not upgradable anymore.
You must be upgrading AF fares only. It's a lot more adventuresome (and cheaper) to buy DL W fares that price like AF A fares and convince the medallion line to change the flight numbers to AF (booked then in W instead of A) and process the upgrade. So far, 3/3 on that, including having one of them done by SINRES during the great AF/KL blockade.