The Thessaloniki 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.
Athens International Airport Eleftherios Venizelos, commonly initialised as AIA, is the largest international airport in Greece, serving the city of Athens and region of Attica. It began operation on 28 March 2001 (in time for the 2004 Summer Olympics) and is the main base of Aegean Airlines, as well as other smaller Greek airlines. It replaced the old Ellinikon International Airport. Athens International is currently a member of Group 1 of Airports Council International (over 25 million) as of 2019, it is the 26th-busiest airport in Europe.