Which airline hub does XXX operate out of?
China United Airlines
China United Airlines Co., Ltd. (simplified Chinese: 中国联合航空有限公司; traditional Chinese: 中國聯合航空有限公司; pinyin: Zhōngguó Liánhé Hángkōng Yǒuxiàngōngsī) is a budget airline with its headquarters in Fengtai District, Beijing, People's Republic of China, operating scheduled flights and charter services in co-operation with local enterprises out of Beijing Nanyuan Airport, making it the only commercial airline using this airport.
Beijing Nanyuan Airport