Originally Posted by
vanillabean
I purchased a couple of AA tickets today and picked seats in MCE after having entered my AS number. The reservation says that “We requested your upgrade.” Would this upgrade be the MCE that I already have or for a potential seat in First Class?
MCE is not an upgrade (and unlike some other airlines, AA doesn't pretend that it is)
Upgrades from economy clear into First or Business (whichever is the next class of service, skipping Premium Economy if it's offered).
MCE is just a better seat in economy and is treated accordingly.