So I've been looking at SFO-SYD in C and both seatcounter and UA's own expert mode shows Z availability (Z5 going there, Z9 going back) yet it will only price me D fare (at $10K or so) when I try to book lowest available business.
How does one get Z when it's showing available but won't... book it?
Btw, I've booked Z to Europe around $3K all-in when D-business was around $6.5K.