DOOR TO DOOR Airport Shuttle! Serving Clemson University and the Upstate Area. ATLANTA/GSP/CHARLOTTE AIRPORTS. LOWEST RATES AVAILABLE - Family Rates & Group Rates. 24 Hour Advanced Reservations Suggested. Door To Door Airport Shuttle! Serving Clemson University And The Upstate Area. Atlanta/GSP/Charlotte Airports. Lowest Rates Available - Family Rates & Group Rates. 24 Hour Advanced Reservations Suggested. 24 Hours - 7 days a week. Telephone Hours: 9am to 10pm - 7 days a week.