Austrian Airlines (OS), sometimes shortened to Austrian, is the flag carrier of Austria and a subsidiary of the Lufthansa Group. The airline is headquartered on the grounds of Vienna International Airport in Schwechat where it also maintains its hub. It flies to six domestic and more than 120 international year-round and seasonal destinations in 55 countries as of July 2016, and is a member of the Star Alliance. The airline was formed in 1957 by the merger of Air Austria and Austrian Airways, but traces its history back to 1923 at the founding of Austrian Airways. During the 2000s, the airline expanded through the acquisitions of Rheintalflug and Lauda Air, and adopted the shortened Austrian name in 2003. Throughout the decade, Austrian sustained several years of losses, and in 2008, its owner, the Austrian government, was advised to sell the airline to a foreign company. In 2009, the Lufthansa Group purchased the airline after receiving approval from the European Commission following an investigation into the tendering process.