The following has been added to the OP based on information from Business ExtrAA customer service:
Code:
Business ExtrAA Awards book into the following inventory:
Award Type Books Into
PlanAAhead - Economy T
PlanAAhead - Business* U
PlanAAhead - First† Z
AAnytime - Economy Y
AAnytime - Business* J
AAnytime - First† F
Upgrade to Business C
Upgrade to First A
* = First class cabin on 2-class flights
† = First class cabin on 2- or 3-class flights
Award Tickets must be booked through AA Meeting Services at 1-800-433-1790
(U.S. and Canada; others contact your local reservations office), and you will
need to provide the Reservations Agent with the Authorization Number from
your award certificate.
I suppose this is basically what one would expect, but I haven't seen it listed elsewhere.