<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by Guy Betsy:
Using ASIAMILES, you can upgrade on CX and BA on any fare.</font>
Not true. On CX, the underlying economy ticket muct be in Y, H, B, K, L, M, or S.
In other words it must be one of the fares that is itself mileage accruing.