«Top flights». Daily chart. The Economist, 14-05-2012. [Consulta: 14 maig 2012]. «Jeju, on the South Korean island of the same name, is not one of the country's 20 biggest cities. Yet the island's allure as a domestic tourist destination resulted in 9.9m passengers flying between Seoul and Jeju (in either direction) in 2011. This makes it the busiest airline route in the world, according to Amadeus, a company that provides technology to the travel industry.»
