Addis Ababa its administrative and communications center. It is the main trade center for coffee, the country's chief export, and for tobacco, grains, and hides. The major industries produce food, beverages, processed tobacco, plastics, chemical products, textiles, and shoes. In addition, the city is the center of the nation's service and finance sectors. Addis Ababa has a large tourist industry. It is the hub of a highway network and a terminus of a railroad that runs to Djibouti, making Addis Ababa an important distribution center. An international airport is near Addis Ababa. The African Union (AU; the successor of the Organization of African Unity) and the UN Economic Commission on Africa are headquartered in Addis Ababa, which also hosts numerous international conferences.