Aegean Airlines SA is 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 destinations as well as to a number of European destinations. Its main hub is Athens International Airport in Athens, with a secondary hub at Thessaloniki International Airport. It also uses six other Greek airports as seasonal bases during the summer. It has its head office in Kifisia, a suburb of Athens. On October 21st 2012, Aegean Airlines announced that it had struck a deal to acquire Olympic Air, and the buyout was approved by the European Commission a year later, on 9 October 2013.[12] Both carriers continue to operate under separate brands.