Originally Posted by
dkc192
I'll note/add that at least IME, these differential E+ fares that book into B are only available on nonstop flights. When trying to book a connecting itinerary with requested fare class B, I get the "full" or "proper" B fare. It's possible that these fares are filed for connecting itineraries, but if so, I have not been able to find and book them.
That looks right to me; I tend to check hub-hub markets and then forget about it
Originally Posted by
fumje
On the mechanics of delegating Business fares —
— I am not sure I'd say "almost always". In my experience, I've mostly seen them delegate to B and affirmatively include no-fee E+ seating. These have been largely, or maybe exclusively, P and Z fares; I'm unsure if that means anything.
That might be newer - in the past we've had numerous threads complaining about delegating to Y and not getting E+, but I do see B permitted on the few Polaris fares I pulled just now.