China's aviation authority on Tuesday unveiled a plan to trial the Seventh Freedom of the Air in the Hainan Free Trade Port (FTP), a move aimed at boosting the opening-up of the air-transport industry.

The Seventh Freedom allows foreign carriers to operate flights between two foreign countries without the need to touch down in the airline's home country.

On each route enjoying the Seventh Freedom, the maximum number of passenger and cargo flights will be seven per week, according to the plan issued by the Civil Aviation Administration of China.

The aviation plan is intended to implement one aspect of a broader master plan, which was made public on June 1, to build the southern island province into a high-level FTP of global influence by the middle of the century.