Question: What country does Chelyabinsk Airport and S7 Airlines have in common?

Context paragraphs:
Oneworld: Oneworld (marketed as oneworld; CRS: *O) is an airline alliance founded on 1 February 1999.  The alliance's stated objective is to be the first-choice airline alliance for the world's frequent international travelers.  Its central alliance office is currently based in New York City in the United States.  Its member airlines include Air Berlin, American Airlines, British Airways, Cathay Pacific, Finnair, Iberia, Japan Airlines, LATAM Airlines, Malaysia Airlines, Qantas, Qatar Airways, Royal Jordanian, S7 Airlines and SriLankan Airlines, plus some 21 affiliated airlines.  As of August 2016, Oneworld is the third largest global alliance in terms of passengers with more than 557.4 million passengers carried, behind Star Alliance (689.98 M) and SkyTeam (665.4 M).  Its slogan is "An alliance of the world's leading airlines working as one."

S7 Airlines: S7 Airlines, legally PJSC Siberia Airlines (Russian: ПАО «Авиакомпания "Сибирь"» "PАО Aviakompania Sibir"), is an airline headquartered in Ob, Novosibirsk Oblast, Russia, with offices in Moscow.  As of 2008, it was Russia's biggest domestic airline.  Its main bases are Domodedovo International Airport and Tolmachevo Airport.

Chelyabinsk Air Enterprise: Chelyabinsk Airlines was an airline based in Chelyabinsk, Russia.  It operated trunk and regional scheduled and charter passenger flights and also leased aircraft to other operators.  It was formerly the Aeroflot Chelyabinsk Division.  Its name was often shortened to "Chelal".  From 1994 the airline operated Yakovlev 42 tri-jet airliners.

S7 (Vienna): S7 is an electrified commuter rail service operating between Floridsdorf and Vienna International Airport, with extended southbound service to Wolfsthal in the greater Vienna area and northbound service to Laa an der Thaya, sometimes ending in Wolkersdorf and Mistelbach.  Between Wien Mitte and the airport, S7 provides local service on the route while the City Airport Train provides non stop express service to the airport.  The S7 uses the former Aspangbahn right-of-way in the city center then, at Kledering, transitions to the former Pressburger Bahn, which connected Vienna and Bratislava, to Wolfsthal.  Average travel time between Floridsdorf and Vienna International Airport is 37 minutes.

Globus Airlines: Globus Airlines (Russian: Авиакомпания «Глобус», "Aviakompanija «Globus»" ) is a Russian airline based at Domodedovo International Airport owned by "S7 Group" and operating for S7 Airlines.

S7 Airlines Flight 778: S7 Airlines Flight 778 (RU778/SBI778) was an Airbus A310-300 on a scheduled domestic passenger flight, serving the route from Moscow Domodedovo to Irkutsk, when it crashed upon landing at Irkutsk International Airport at 07:44 local time on 9 July 2006 (8 July, 22:44 UTC).  The plane overshot the runway, sliding over several hundred metres of wet runway and grass.  It crashed through a concrete barricade, hit a group of private garages and burst into flames.  Television pictures showed smoking ruins of the Airbus with only the tail section intact.  It took two hours for local firefighters from five different fire stations to extinguish the blaze.

1950 Sverdlovsk plane crash: The Sverdlovsk plane crash of 5 January 1950 killed all 19 persons on board, including almost the entire national ice hockey team (VVS Moscow) of the Soviet Air Forces – 11 players, as well as a team doctor and a masseur.  The team was on board a twin-engined Lisunov Li-2 transport aircraft, a licensed Soviet-built version of the DC-3, heading to a match against the Dzerzhinets (Chelyabinsk) (Traktor Chelyabinsk) hockey club.  Due to poor weather at Chelyabinsk, the flight diverted to Sverdlovsk.  The crew attempted four approaches but during the fifth approach to Koltsovo Airport at Sverdlovsk in the Soviet Union' s Russian Soviet Federated Socialist Republic, the aircraft crashed near the airport in extremely adverse weather conditions involving a heavy snowstorm with strong winds.

Enkor: Enkor (full name is "Joint Stock Company (JSC) Enkor") was an airline based in Moscow, Russia.  It operated scheduled international passenger services and provided technical aircraft maintenance.  Its main bases were Domodedovo International Airport, Moscow, Ulan Ude Airport (UUD) and Chelyabinsk Airport (CEK).  In 2004 the airline merged with S7 which inherited their fleet of TU-154M aircraft.  The TU-134 and Yakovlev Yak-42 aircraft were retired and the TU-154B2 was sold to Kolavia.

Chelyabinsk Airport: Chelyabinsk Airport (IATA: CEK, ICAO: USCC) is an airport in Russia located 18 km north of Chelyabinsk.  It services large airliners and can park up to 51 aircraft.  It also serves as a secondary hub for S7 Airlines and Ural Airlines.

Chelyabinsk Shagol Airport: Chelyabinsk Shagol Airport (also Bakal) is an airfield in Russia located in the northwest part of Chelyabinsk.  It was the first airport in Chelyabinsk, opened in 1938.  Since 1953, all passenger traffic is handled by Chelyabinsk Balandino Airport, and Shagol Airport is used by the local pilots' training school, the Chelyabinsk Red Banner Military Aviation Institute of Navigators.  In August 2007 it was used in military exercises of Shanghai Cooperation Organisation.  It was a military bomber training base during the Cold War and had about 35 Tupolev Tu-134 UBLs based as recently as 1995.  The airport can park over 40 aircraft.  It is also used for air shows.

Supporting paragraphs: Chelyabinsk Airport S7 Airlines
Answer: Russia