Originally Posted by
ryman554
Curious why you are suggesting to look at B first? Aren't R and A usually a lot less than B? Notwithstanding the higher UG probability, the PE fare also translate to B domestically and (should) carry the "instant PN upgrade" as well. Perhaps there is no PE on this route...
This is for the special domestic E+ B fare than can be very reasonably priced and as you point out, becomes eligible for instant PN upgrades. Internationally, I have never seen B fares that are cheaper then PE and PE will trump B anyway