7015309 is Costco. We are members, but we have never been asked for a card. Costco has revamped their car rental website so you have to put your membership number in online at the time you make the reservation (last time I checked, anyway).
Also: I reserved a car for Jan 31 into to February, and found that the Alamo Insider coupon "2-car upgrade" gave a much better price than Costco's coupon for the larger car sizes. You choose a Compact, and get a Standard. Choose a Mid, get a Full. So if you always rent a larger car (which we do), this other Insider coupon may be a better deal for you.
- bcc