Olympic Air S.A. is a regional airline, a subsidiary of the Greek carrier Aegean Airlines. It was formed as part of the privatization of the former Greek national carrier Olympic Airlines, a company that carried the name Olympic Airways from 1957 to the beginning of the 21st century. Olympic Air commenced limited operations on 29 September 2009, after Olympic Airlines ceased all operations, the full-scale opening of the company taking place two days later on 1 October 2009. Its main hubs are Thessaloniki International Airport and Athens International Airport. Rhodes International Airport serves as a small secondary hub. The airline's headquarters are in Building 57 at Athens International Airport in Spata, and its registered seat is in Koropi, Kropia, East Attica.

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.