- S7 Airlines, also known as Siberia Airlines, is a Russian airline that is based in Ob, Novosibirsk Oblast. It is the largest domestic airline in Russia and operates both domestic and international flights. S7 Airlines is a member of the Oneworld alliance and has codeshare agreements with several other airlines. The airline has a fleet of modern aircraft and provides various services to its passengers, including in-flight entertainment and onboard Wi-Fi. S7 Airlines has won several awards for its customer service and is known for its punctuality and reliability.