Originally Posted by JonNYC
Honestly. I don't think you really are familiar, at all, with how much -B- fares, where available, actually cost-- I've seen you massively misstate the costs of -B- fares before-- they are very expensive as a general rule. I also don't understand what you think the advantages are in your case-- what, exactly, do you think they do for you?
B class fares are the lowest economy fares that can be upgraded using miles at the full fare economy rate (fewer miles and no co-pay to upgrade). They also tend to be the cheapest fares that are very flexible.