Thank you for your in-depth knowledge. I missed this previous post.

Don't we actually have four types of FFCs now? FFC cannot be transferred between N class and regular fares. They are two types to begin with. Now each can have original and residual which make them four types: Original N Class, Original Regular, Residual N Class & Residual Regular. I don't purchase N class fares so I have Original Regular and Residual Regular FFCs. So complicated.