Passengers look on June 12, 2014 at planes belonging to China's Hainan Airlines at the gate at Haikou airport in south China's Hainan province.

Chinese authorities have ­detained two people working within the aviation sector for ­allegedly giving fugitive tycoon Guo Wengui information about passengers using Hainan Airlines, the carrier at the centre of his claims detailing corruption at the top ranks of the Communist Party, state media has reported.

Guo, who lives in New York, has said relatives of Wang Qishan, the party's top graft-buster, are undisclosed shareholders of the airline's parent company, HNA Group, giving it a powerful ­political connection that helped it secure aggressive growth in the market.