After you arrive at CLT, exit the baggage claim and arrivals area of the terminal building’s lower level. Once you are outside, use the crosswalk and covered walkway cross the road to the Level 2 lobby of the parking garage. Once inside the lobby, look for the SIXT counter. When returning your Charlotte Douglas International Airport car rental, follow the signs to the Hourly Deck. Drive past the entrance to that deck and take the next left following the sign for Rental Car Returns. Park in one of the SIXT spaces.