Here is what I've compiled so far ... please advise if any changes needed:

AZ Awards:
Economy: U class
Business: Z class

KE Awards:
Economy: U class
Business: D class
First: A class

KL and NW and MH (not SkyTeam) travel:
Economy: W class (on KL, at least)
Domestic First: A class
Int'l Business: D class

DL Awards:
Y to C upgrade: Z class
Int'l Business: O class
Domestic First: R class

AF Awards:
Economy: X class
Business: O class
First: A class

AM travel:
Business: C class

CO travel:
Dom First/Intl Business: E class