Aegean Airlines S.A. is the flag carrier of Greece and the largest Greek airline by total number of passengers carried, by number of destinations served, and by fleet size. A Star Alliance member since June 2010, it operates scheduled and charter services from Athens and Thessaloniki to other major Greek, European and Middle Eastern destinations. Its main hubs are Athens International Airport in Athens, Macedonia International Airport in Thessaloniki and Larnaca International Airport in Cyprus. It also uses other Greek airports as bases, some of which are seasonal. It has its head office in Kifisia, a suburb of Athens.

A flag carrier is a transport company, such as an airline or shipping company, that, being locally registered in a given sovereign state, enjoys preferential rights or privileges accorded by the government for international operations.