Xi'an Xianyang International Airport is an international airport serving the city of Xi'an, the capital of Northwest China's Shaanxi province, as well as the whole Guanzhong area. Covering an area of 12 square kilometres (4.6 sq mi), Xi'an Airport has four terminals: T1, T2, T3, and T5. The total terminal building area exceeds 1.1 million square meters, making it one of the largest passenger airports in China, it is also 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 and since then, China Eastern continues to operate as a hub at Xianyang. Xi'an Airport is also the hub for Sichuan Airlines and Hainan Airlines. Xi'an Xianyang International Airport is a Skytrax 4-star airport.