Lol, I wonder if we are on the same flight. This just happened to me as well. I am on CX838 on 16 Nov booked in F, now they changed from a 74A to 77W and it's a two class plane. Called AS who I am booked through and there is no F avail to YVR, SFO or LAX within 3 days! I am getting increasingly frustrated with CX, they have changed my honeymoon around twice now which has made me make numerous other changes. The AS rep said I will likely have 2 other changes by the time I leave so I should stick tight with F booking and see if something opens up. Nice, and F award with one out of 4 flight actually in F! Ideas?