Mainland China and Taiwan are negotiating new direct flight routes to augment a landmark deal in June.

They are discussing direct flights to Chengdu, Chongqing, Dalian, Guilin, Hangzhou and Shenzhen while Beijing, Guangzhou, Nanjing, Shanghai and Xiamen already receive Taiwan flights.

New flight paths are also being negotiated, a spokeswoman for Taiwan's Mainland Affairs Council said. Direct flights must now detour through Hong Kong airspace for "security reasons".