I have a return on a TPE-HKG-SFO-HKG-TPE that I am trying to change. I paid about US$3000 for the RT ticket in D class. My understanding is that D class is discounted business but less discounted than I class. My fare is a screaming deal so I don't blame CX for limiting capacity on it. I'm just trying to figure out how they figure availability.

The flights I want are showing plenty of availability in both D and I class. My D class seems to be less valuable than I class however.

CX () 873 0 SFO 10/06/10 1:20 AM HKG 10/07/10 6:25 AM F4 A4 J9 C9 D9 I2 Y8 B7 H5 K0 M0 L0 V0 S0 N0 Q0 O0
CX () 879 0 SFO 10/05/10 1:35 PM HKG 10/06/10 7:00 PM F4 A4 J8 C7 D7 I3 Y9 B9 H9 K9 M0 L0 V0 S0 N0 Q0 O0

Is there more than one flavor of D class that is not shown on Expertflyer? How is my D not better than I? Can anyone shed more light on this?

Thanks,
Paul