Join Date: May 1998
Location: Reno, NV (RNO)
Programs: AA LT Platinum, AS, UA Premier Silver, DL, HHonors Gold, Marriott LT Titanium, Hyatt, IHG Platinum
Posts: 4,723
Here's my list. I haven't updated in quite sometime so don't know if all are still valid. I have a different CostCo number than posted above (it may be old).
Alaska Air K197800
Starwood K817200
HHonors K851000
Inside Flyer A205700
Continental K024400
American K817100
British Airways B335100
Hyatt K817700
United K019300
Costco A108325
BJs Wholesale A415900