Aeroflot is Russia's largest airline and flag carrier. It traces its origins back to 1923 and was the national airline of the Soviet Union. Aeroflot is now semi-privatized, with 51% state ownership. It operates domestic and international flights from its main hub at Sheremetyevo International Airport in Moscow to 129 destinations. Aeroflot joined the SkyTeam airline alliance in 2006 and has codeshare agreements with over 20 other airlines.