There is a bus station by one side of the Ground Transportation Centre. Numerous bus-routes serve the airport. "A" (Airbus) buses offer speedy links to many parts of the city, including destinations in Hong Kong island, Kowloon and the New Territories. "E" (external) buses serve commuter traffic. "N" buses operate in the night-time. "S" (shuttle) routes run short services around and about the airport. "DB" services are heading to and from Discovery Bay on nearby Lantau island.