Hi Robg and welcome to FlyerTalk.

The MilesBuzz forum is for the posting of the latest frequent flyer program buzz.

There's different methods for doing what you want to do depending on the airline you want to fly. You're best bet would be to do a search in the forum of the airline you are looking at (usig the keywords "fare code"). Failing that, re-post your question in that airlines forum.

I'm going to close this here.

Regards,

Flipside