Cambridge has been the primary site of aeronautics in Hobart from its opening in the 1920s. In July 1934 the federal government compulsorily acquired 190 acres (77 ha) of land from a local farmer to establish an aerodrome on the current site. It served as Hobart's main airport until the International Airport opened in 1956. Today it is the base of Par Avion, which specialises in day trips and scenic flights around Hobart and the South West Wilderness of Tasmania, and also the Aeroclub of Southern Tasmania. According to Par Avion's owner, Airlines of Tasmania, a third runway has been opened but is not yet listed in the AIP.