Took a trip down earlier in the year and had not intended to go back, therefore threw my DC card, etc. in the trash (since it expires at year's end). Family has now decided to go back down later this year. Can I still use the DC discount on my card rental? Intend to us Emerald Aisle. Do you have to should you DC card on the way out of the lot? I recall having to on some occasions and not having to on other occasions.