Which airline that has Chelyabinsk Airport as a secondary hub is based in Yekaterinburg, Russia?
Chelyabinsk Airport:  It also serves as a secondary hub for S7 Airlines and Ural Airlines. Ural Airlines: Ural Airlines (Russian: Ура́льские авиали́нии , "Ural’skiye avialinii") is an airline based in Yekaterinburg, Russia, operates scheduled and chartered domestic and international flights out of Koltsovo International Airport.
i don't know