Xi'an Xianyang International Airport (IATA: XIY, ICAO: ZLXY) is the main airport serving Xi'an, Shaanxi Province, as well as the whole Guanzhong area. Covering an area of 5 square kilometres (1.9 sq mi), it is the largest airport in Northwest China, and the second largest airport in Northern China. The airport was the hub for China Northwest Airlines until the company was merged into China Eastern Airlines in 2002. Xi'an Airport is also the hub for Joy Air and Hainan Airlines. Xi'an Xianyang International Airport is a Skytrax 4-star airport.