Join Date: Jul 2003
Location: CGK
Programs: SQ TPP30, CX DM, DL P, FB P, AA G, GA CB, WOH LGLOB, HH D, MB G, Hertz P
Posts: 2,887
AFAIK, SQ used to use "J" as their full fare business class. They are changing it to "C" to be aligned with other Star Alliance airlines. They are also changing "P" (First Class) to "F" for the same reason.
SQ uses "D" for discounted Business Class & RTW Business Class. I don't know they are using "J".
StarG