The Peoples Republic of China is served by both important overseas flights to majority of nations in the world and a range of regional or domestic airlines. Air transportation in mainland China is frequently linked through Shanghai, Beijing, or Guangzhou. They are, in that order, the principal hubs for China Eastern Airlines, Air China, and China Southern Airlines. The civil aviation sector of the country transported approximately 620,536,534 passengers and 11.578 million tons of cargo in 2011.