S7 Airlines, legally JSC Siberia Airlines (, "АО Aviakompania Sibir"), is an airline headquartered in Ob, Novosibirsk Oblast, Russia, with offices in Moscow. As of 2008, it was Russia's largest domestic airline, with its main bases at Domodedovo International Airport and Tolmachevo Airport. It is a member of the Oneworld alliance but its membership is currently suspended due to Russia's invasion of Ukraine. History Early years What is now S7 Airlines started in 1957 as "the Tolmachevo united squadron" of the General Directorate of Civil Aviation of the Soviet Union. After the Soviet Union disintegration and during the 1990s Russian economic reforms, a state-run Siberia Airlines was created based on the squadron in 1992 and later privatized in 1994. The same year Siberia was assigned an IATA airline code. In 1997, Siberia Airlines tried to buy Vnukovo Airlines, to make Moscow its next main hub, but the purchase did not proceed. After the 1998 Russian financial crisis, Vnukovo Airlines was heading towards bankruptcy, and Siberia Airlines offered to merge the two airlines, but Vnukovo refused. In 1999, Siberia Airlines signed a document offering to take over Vnukovo Airlines, in the event Vnukovo ceased operations due to insolvency. Development since the 2000s Siberia Airlines began merging with Vnukovo Airlines in 2001. The same year, the airline absorbed Baikal Airlines and then in 2004, the airline absorbed Chelyabinsk Airlines and Enkor. The first non-Russian aircraft, Airbus A310s, were acquired in 2004. In summer 2004, during the Farnborough Airshow, the company signed a memorandum of understanding to purchase fifty Sukhoi Superjet 100s, with the first to be delivered in 2007. However, the airline subsequently dropped its plans to order this aircraft, citing that the aircraft's changed specifications no longer met its requirements. Siberia Airlines rebranded itself as S7 Airlines in 2005. In line with an International Air Transport Association (IATA) resolution, from December 2006 the airline began to publish its fares for international destinations originating in Russia in euros, rather than US dollars. This resulted in a fare increase, as the conversion rate used was 1 euro = 1 US dollar. Fuel surcharges were also published in euros. Its domestic fares were still to be shown in the local currency. Also in December 2006, the airline became the second Russian air carrier to complete, and pass, the IATA Operational Safety Audit, which is the first global air safety standard. In April 2007 S7