Which airport does XXX operate in?
Air China
Air China Limited (simplified Chinese: 中国国际航空公司; traditional Chinese: 中國國際航空公司; literally: ``China International Airlines Company'', colloquially known as 国航/國航, SEHK: 0753, LSE: AIRC, SSE: 601111) is the flag carrier and one of the major airlines of the People's Republic of China, with its headquarters in Shunyi District, Beijing.