However, you can still retrieve details for any Fare (including any Business or First Class Fare) using the [Other Fare] option and entering the Fare Basis Code, even if that Fare is not shown in the displayed list.
And how, exactly, am I supposed to look up the details of a Fare Basis Code if the code itself isn't shown? To use the Other Fare feature you need the fare code. I usually use KVS to find fares. If I already know what they are, it kind of defeats the purpose.