Hainan Airlines Co., Ltd. is an airline headquartered in Haikou, Hainan, China. It is the largest civilian-run and majority state-owned air transport company, making it the fourth-largest airline in terms of fleet size in the People's Republic of China, and the tenth-largest airline in Asia in terms of passengers carried. It operates scheduled domestic and international services on 500 routes from Hainan and nine locations on the mainland, as well as charter services. Its main base is located at Haikou Meilan International Airport, with hubs at Beijing Capital International Airport and Xi'an Xianyang International Airport and several focus cities.

Haikou is the capital and most populous city of the Chinese province of Hainan. Haikou city is situated on the northern coast of Hainan, by the mouth of the Nandu River. The northern part of the city is on the Haidian Island, which is separated from the main part of Haikou by the Haidian River, a branch of the Nandu. Administratively, Haikou is a prefecture-level city, comprising four districts, and covering 2,280 square kilometres (880 sq mi). There are 2,046,189 inhabitants in the built-up area, all living within the four urban districts of the city.