Originally Posted by
gaidamak
Can someone explain how to make a back-up reservation when using doubtful codes without risking credit card charges of the unused reservation?
Book a second rez with a different car rental company. Most car rentals do not require cc at time of booking (Avis does not).
By doing this you have control over what you are going to pay vs having Avis tell you the rate you have booked is not valid and they then turn around and charge you the 'rack' rate when you're standing dumbfounded at the counter.