Originally Posted by
canadiancow
Can you elaborate on that? S...TG is a specific set of restrictions on S class space. The FP has its own set of restrictions (advance purchase, round-trip, Saturday night stay, etc.), so I don't really see how a published fare would be relevant.
You're right. To be clear, I was focusing on the OP's checking of S class on EF (because I'm not assuming that the FP engine has this necessarily correct, so checking Standard S basis will at least tell you that). Everything else you mention is "fair game" as well regarding any potential information the OP might need to consider.