Trying to book some sectors for my DONE4 - BKK-MEL on Jul 19. Using KVS which sources from ITN/CWT. Obviously need D, which has never before been a problem.

For that date on QF2 I get:

F4 A3 J8 C5 D0

Dates on either side all have D availability.

What is the C fare bucket? And why is it higher than D - I had always thought it was J then D then I (sometimes)?

My alternative is to route via HKG - which is fine except I lose most of that day in BKK (11am departure rather than 6pm).