There are four airports in Qingdao, including three military airports and one civilian airport. The civilian airport is called Qingdao Liuting International Airport, and the three military airports are called Tuandao. Naval water airport (used for training), Cangkou Military Airport (used for training), Laoshan Heliport (used for missions). Liuting International Airport was built in 1944. The first phase of the expansion project was completed in November 1987. The second phase of the project was completed in 2004. In 2005 It was upgraded to an international airport, and the third phase of the expansion project was completed in 2007. On August 12, 2021, as Jiaodong International Airport began official operations, Liuting International Airport was closed. Qingdao Liuting International Airport is located in Liuting Street, Chengyang District, Qingdao, Shandong Province. It is about 23 kilometers away from the city center of Qingdao. It is a 4e civil international airport and one of the 12 major trunk airports in China. In 2017 In 2016, the passenger throughput of Liuting International Airport reached 23.21 million, a year-on-year increase of 13.2%, and the number of takeoffs and landings was 178,800, a year-on-year increase of 178,000. 6.5. Tuandao Naval Water Airport has an area of ??0.182 square kilometers and an altitude of 24 meters. It was the first place where the Qing government set up a fort in Qingdao. It was divided into several small islands before, but after the German occupation, it was The islands were connected together to form the current scale. Because of its unique geographical location, it has been used as a military location in history.