First comment from this forum :
"
ALAMO (I.D. #):
675899 and Rate Code: BY (Costco)
693798 and Rate Code: 5K (American Express)
807303 and Rate Code: BY (American Express, added by 'thereuare')
AVIS (AWD #):
D002807 (Amateur Sports Assistance Program (ASAP)
K774100
K312601 (American Express)
B900000 (generic AAA code)
B790000 (
Entertainment Book)
K197800 (Alaska Air)
K817200 (Starwood)
K860600 (Starwood - seems to be geared towards higher Hawaii discounts)
K851000 (Hilton HHonors)
A205700 (Inside Flyer)
K0205700 (Continental)
K817200 (American! )
B335100 (British Airways)
K817700 (Hyatt)
K019300 (United)
A108325 or A108300 (Costco)
A415900 (BJs Wholesale)
K666403
A359800
B270898
A699800
L149332
Budget
(BCD #):
X474200 (
Travelocity)
W852802 (Costco)
X251000 (Smarter Living)
Dollar
(Promo Code):
Globe
New
Trib
FVG (Florida Vacation Guide -this may work for other states too)
Enterprse
Corporate ID: 01A8037
ERAC999 (cars from $9.99/day)
METRO15 (15% off, not valid at airport locations)
Hertz (CDP #):
000004 (AAA-Auto Club of Southern California)
000252 (AAA Texas)
336436 (Costco)
205521 (
Entertainment Book)
154080 (Marriott)
1244828 (Smarter Living)
321739 (Alaska Airlines)
1181885 (Aloha Airlines)
217692 (American Airlines)
391867 (Continental Airlines)
165385 (Delta Air Lines)
1241216 (Frontier Airlines)
1037681 (Hawaiian Airlines)
384989 (Midwest Express)
269339 (Northwest Airlines)
205418 (Southwest Airlines)
62455 (United Airlines)
157348 (US Airways)
(Promotional Code - PC#):
928222 in the U.S.
928223 in Canada
Thrifty 
5512 (AAA Discount Code)
AU11 (5% off)
NATIONAL (CONTRACT I.D. #):
5042902 (American Express)"
see this forum at :
http://www.betterbidding.com/index.php?act=ST&f=304&t=238
