Originally Posted by
Lucky_man
I finally got a chance to contact QF and LHR/MEL/Europe FF raises a valid point. It was S class and S class does not count for CX or KA which is surprising because it is an upgradable fair on QF.
Different airlines have different meanings for booking classes. R on QF, for example, is a premium economy booking class, but on BA it's now a business booking class. So there is no natural read-across from any airline to any other airline.
For future reference, QF makes it easy to tell in advance whether there may be such a problem. The "airline earning table" is here:
http://www.qantas.com.au/fflyer/dyn/...m/terms#jump25