Olympic Air S.A. (Greek: Ολυμπιακή) is a regional airline, a subsidiary of the Greek airline carrier Aegean Airlines. It was initially formed from 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, with the official full-scale opening of the company taking place two days later on 1 October 2009. Its main hub is Athens International Airport, with Rhodes International Airport serving as 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.