Thessaloniki Airport Makedonia is an international airport serving Thessaloniki, the second-largest city in Greece. It is located 13 km (8.1 mi) southeast of the city, in Thermi. The airport is the third-largest airport in the country after Athens International Airport and Heraklion International Airport. It opened in 1930 and was the second-busiest airport in Greece in terms of flights served and the third-busiest in terms of passengers served in 2016, with over 6 million passengers. It is the main airport of Northern Greece and apart from the city of Thessaloniki it also serves the popular tourist destination of Chalkidiki and the surrounding cities of Central Macedonia. The Athens–Thessaloniki route is the tenth busiest in the EU with 1.8 million passengers. To cope with demand, a second terminal is currently under construction as part of a billion-euro investment by Fraport Greece, the company which operates the airport.