Limited upgrade offer->Fare class
Hi,
I am currently considering an upgrade from Economy to Premium Economy on my upcoming LHR-HKG flight because see a limited offer on my booking page, but I am curious what the impact is on the fare class of my ticket.
If I purchase the upgrade, will my ticket be reissued with the new fare class (I assume E or T) and will I also earn miles (at AAdvantage) based on this new fare class?