Ethiopia’s new US$12.5 billion mega-airport project has thrust the nation into the heart of a geopolitical tug of war between the United States and China.Ethiopian Airlines, Africa’s largest carrier, is developing the massive Bishoftu International Airport, located 40km (25 miles) southeast of the capital Addis Ababa to serve as a primary hub for African trade and travel.The project has triggered intense competition between would-be contractors from around the world, but Chinese state-owned...