True - but that's missing the point I was trying to make.

I guess F must be a relatively new AZ fare class, but here is another example of a fare class which is not one of the very cheapest - and which sits higher than other FB-earning classes - which earns nothing.

If you're going to have non-earning classes, make sure that they are the cheapest economy classes...don't spread them randomly throughout the full family, or rather, don't wait months after a partner changes their fare structure before changing the FB earning table to reflect the changes!