As the earliest enterprise that obtained the general flight qualification, CITIC Offshore Helicopter Co. Ltd., stock-shared by COAG, can provide professional helicopter flight services for offshore oil exploration and development in such four sea zones as the Bohai Sea, the East China Sea, the Yellow Sea and the South China Sea. The three shipping companies subordinated to COAG can provide such freight services as crude oil, ores, coal, bulk cargoes and various types of containers etc. and their annual capacity can reach more than 12 million tons; meanwhile, COAG possesses the grade-one qualification of international freight forwarder and CNPC, SNP and ANSTEEL etc. are its long-term customers.