Thanks for the quick response Kiwi Flyer. I will be PPS in three weeks time but that doesn't help me much right now. You basically confirmed what I feared. I was just surprised that all the availability tools show seats in D which nobody else seems to be able to see.

I'll call SQ again tomorrow and see if there's anything there, if not, I'll fly on the 19th and reschedule some of the other legs.