Port San Antonio is a multi-purpose, 1,900-acre (7.7 km²) facility in San Antonio, Texas, USA established to serve as an aerospace complex, international airport and industrial hub with two railroads and close access to three interstate highways. Established at the former site of Kelly Air Force Base, the 1,900-acre (7.7 km²) facility is centrally located between the coasts of the United States and along the NASCO corridor between Canada and Mexico.