How did airports encourage city growth? A. Which model for city growth states that cities grow outward along transportation routes, forming shapes like spokes on a wheel? A. the Burgess model B. the Hoyt model C. the Jenson model D. the multiple nuclei model They promoted the building of hotels, restaurants, services, and rapid transit to accommodate travelers. B. They are so big and require so much land that they need a larger population to be sustained. C. They limit the effects of gridlock and make travel more pleasant. D. They were responsible for transporting over 13 billion tons of materials.