Not sure if these have been posted but here are all the UA class codes

Class Codes - UNITED AIRLINES

A UA FIRST CLASS
AN UA FIRST CLASS
B UA ECONOMY
BN UA ECONOMY
C UA BUSINESS
CN UA BUSINESS
D UA BUSINESS
DN UA DELUXE NIGHT
E UA ECONOMY
F UA FIRST CLASS
FN UA DELUXE NIGHT
H UA ECONOMY
HN UA ECONOMY
I UA Business - Upgrade from Economy
J UA BUSINESS
K UA ECONOMY
KN UA ECONOMY
L UA ECONOMY
M UA ECONOMY
N UA Economy - Award
NC UA BUSINESS
NF UA F/C UPGRADE
NS UA COACH
O UA Business - Award
P UA FIRST CLASS
Q UA ECONOMY
R UA First - Award
S UA STANDARD
T UA ECONOMY
U UA ECONOMY
V UA ECONOMY
W UA ECONOMY
X UA First - Upgrade from Business
Y UA ECONOMY
YN UA ECONOMY
Z UA BUSINESS

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Hi Carl,
Ozstamps has a thread in the FAQs which has a complete list of these.

http://www.flyertalk.com/forum/showthread.php?t=113792

Best idea would be to review there and post any errors / additions