Airbus secured an order for 137 A320neo jets from Chinese airlines, extending the European company’s edge in one of aviation’s most contested markets as US rival Boeing waits on a long-speculated deal with Beijing. China Southern Airlines, one of China’s three major state-owned carriers, announced the deal on Wednesday. The airline, based in the southern city of Guangzhou, will purchase 102 aircraft, while its subsidiary Xiamen Airlines will acquire the remaining 35. The orders carry a combin...