Wirelessly posted (BlackBerry8703e/4.1.0 Profile/MIDP-2.0 Configuration/CLDC-1.1 VendorID/104)
First, congratulations on your upcoming wedding.
If the only certificates offered are those that are good for a "round trip" rental (i.e., car must be returned to renting location), then I would not count on the certificates being worth anything on a one-way rental. It sounds like you need a certificate valid for $XXX off of a car rental, but I do not know whether HHonors offers any of those. Good luck!