###HUMAN: what kinds of ground transportation is available in DALLAS FORT WORTH, ###ASSISTANT: SELECT DISTINCT ground_service.transport_type FROM city AS CITY_0, city AS CITY_1, ground_service WHERE (ground_service.city_code = CITY_0.city_code AND CITY_0.city_name = 'DALLAS') OR (ground_service.city_code = CITY_1.city_code AND CITY_1.city_name = 'FORT WORTH')