When using the Awards/OneWorld Method, if a class does not show-up at all it simply means that there is currently no award availability in that class on any of the flights, shown in the results.
There is really no way to predict if/when award seats will become available...
So if I see an FS- somewhere in the list, then there will be an FS+? If FS doesn't show up at all (or C, or W, or Y, as well), then there is currently no F award availability. OK. Thanks.