Ever heard of an aerotropolis? Well, picture Hartsfield-Jackson International Airport and its environs as a city, with hotels, businesses, entertainers and whatever any vibrant community might offer. An alliance has been formed to make it happen. Today, a Porsche executive explains the initiative, while a UNC professor who coined the term explains the significance of an airport city to the region. Finally, an Asian diplomat encourages stronger trade, investment and collaborative ties between Atlanta and Taiwan.