Here's a list of AWD numbers that work and the discounts I got when I tried them. I tried to identify the program associated with the AWD but was not able to every time.

You should really only use these codes if you can prove you are eligible for the discount. Loyalty and reward programs are really cracking down on this sort of thing. PM me for more information.

AWD # Name Discount (%)
A074800 Citicorp Leisure Travel 58.9
A114300 Florida state government rate 58.9
G930700 IBM 56.4
A972200 Farmers insurance 50.2
A555084 Military discount 50
A686200 Priceline 47
S705900 One-way car rental from Florida $9.95/day 45
A733315 Priority Pass 44.2
B254700 Savers Clubs of America 44.2
B021615 Walmart 43
D302003 Sears customers 43
A076600 Compuserve Travel Forum 33.7
D730300 2 free days on weekly rental in Europe 28
K851000 Hilton Hhonors 22.7
A108303 Costco 15.4
A108335 Costco 15.4
A108326 Costco 15.4
A108300 Costco 15.4
A108325 Costco 15.4
L093590 Kellwood Corporation 14.9
G417900 Kellwood Corporation 13.1
B935221 Sam's Club 12.7
B790000 Entertainment Book 12.7
K020500 America West Flight Fund 12.7
K850800 Best Western Rewards 12.7
C280613 Sam's Club 11.6
Q177800 Costco? 10
G833800 Save up to 10% on weekend rental 10
H855900 Save up to 20% on any rental 5
H855900 Save up to 20% at non-airport locations 5
K462601 One way to/from airport $20 Varies