Discover Card certificates for car rentals do not work
Discover Card offers to let you redeem $20 of cashback bonus for a certificate that is supposed to be worth $40 at Enterprise, a certificate that is supposed to be worth $40 at Thrifty, or a certificate that is supposed to be worth $40 at Alamo.
Enterprise's website said they had cars. On Discover's site, I found the code (DISCBB) to tell Enterprise's website that I am using one of the certificates ( https://www.discovercard.com/cardmem...modeCode=CP092 ), and it says that "No black out dates apply" ( https://www.discovercard.com/cardmem...lPartnersTerms ). However, if I try to reserve online with the code, it says that they sold out and there will be no cars available; if I then start another browser window and do not mention the certificate, it says that there are cars. So they do have cars, just not for anyone using the $20/$40 thing. I thought of calling on the phone, confirming that a car was available, and then saying, "oh wait, I have this certificate", but the rules for the Enterprise certificate require you to use a special phone number and say that you cannot use it at the regular phone number. So they know as soon as your dial. Clever.
The only other rental car company for which I can get the certificates is National, but National charges over $40 more (without the certificates) than other rental car companies at the airport where I am going, so it would cost more using the certificates at National than renting from another company without the certificates.
I do not think that you can even get back the $20. I think you lose it.
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Originally Posted by Stephen Weinstein
...it says that "No black out dates apply"
Welcome to Flyertalk.
This statement, which often appears in marketing materials, means only that there are no predetermined dates on which the offer is invalid. It does not mean that there are no capacity controls, which limit the number of redemptions on a date. You will encounter the same with most airline, hotel, and car rental programs.