Boise Airport (IATA: BOI, ICAO: KBOI, FAA LID: BOI) (Boise Air Terminal or Gowen Field) is a joint civil-military airport three miles south of Boise in Ada County, Idaho, United States.
 The airport is operated by the city of Boise Department of Aviation and is overseen by an Airport Commission.
 It is by far the busiest airport in the state of Idaho, serving more passengers than all other Idaho airports combined and roughly ten times as many passengers as Idaho's second busiest airport, Idaho Falls Regional Airport.
Lufthansa CityLine GmbH is a German airline with its headquarters on the grounds of Munich Airport.
 It is a wholly owned subsidiary of Lufthansa and maintains hubs at Frankfurt Airport and Munich Airport, from where it operates a dense domestic and European network as a member of Lufthansa Regional.
 Since October 2015, it also operates some long-haul routes on behalf of its parent company.
Belfast International Airport (IATA: BFS, ICAO: EGAA) is an airport 11.5 NM northwest of Belfast in Northern Ireland.
 Formerly known as Aldergrove Airport, after the nearby village of Aldergrove, Belfast International is Northern Ireland's busiest airport and the second busiest airport on the island of Ireland, second only to Dublin Airport.
 In 2016, over 5.1 million passengers travelled through the airport, marking a 17% increase compared with 2015.
Munich Airport (IATA: MUC, ICAO: EDDM) , German: "Flughafen München" , is a major international airport near Munich, the capital of Bavaria.
 It is the second busiest airport in Germany in terms of passenger traffic behind Frankfurt Airport, and the seventh-busiest airport in Europe, handling 42 million passengers in 2016.
 It is the world's 15th-busiest airport in terms of international passenger traffic, and was the 34th-busiest airport worldwide in 2015.
 As of February 2017, the airport features flights to 248 destinations, making it the airport with the fifth-most destinations worldwide.
 Munich Airport serves as the secondary hub for Lufthansa including Lufthansa Regional and its Star Alliance partners besides Frankfurt.
On 6 January 1993, Lufthansa Cityline Flight 5634 was on a flight from Bremen Airport to Paris-Charles de Gaulle Airport in France.
 The Dash 8-311, registration D-BEAT, with 23 passengers and crew took off from Bremen Airport at 17:30.
Heathrow Airport (also known as London Heathrow) (IATA: LHR, ICAO: EGLL) is a major international airport in London, United Kingdom.
 Heathrow is the second busiest airport in the world by international passenger traffic (surpassed by Dubai International in 2014), as well as the busiest airport in Europe by passenger traffic, and the seventh busiest airport in the world by total passenger traffic.
 In 2016, it handled a record 75.7 million passengers, a 1.0% increase from 2015.
Turku Airport (IATA: TKU, ICAO: EFTU) , is located in Turku, Finland, 8 km north of Turku, in "Lentokenttä" (Finnish for "airfield"; Swedish: "Flygfältet" ) district in the Maaria-Paattinen ward of Turku.
 It serves approximately 320,000 passengers per year, being the fourth busiest airport in Finland by the number of passengers (in 2012) and second busiest airport by the amount of cargo tonnes (in 2012).
 Turku Airport is exclusively operated by the state-owned company Finavia.
 Among normal operation the airport offers differentiated service specifically designed for low-cost airlines since 2008.
Frankfurt Airport (IATA: FRA, ICAO: EDDF) (German: "Flughafen Frankfurt am Main" , also known as "Rhein-Main-Flughafen") is a major international airport located in Frankfurt, the fifth-largest city of Germany and one of the world's leading financial centres.
 It is operated by Fraport and serves as the main hub for Lufthansa including Lufthansa CityLine and Lufthansa Cargo as well as Condor and AeroLogic.
 The airport covers an area of 4942 acres of land and features two passenger terminals with a capacity of approximately 65 million passengers per year, four runways and extensive logistics and maintenance facilities.
Rochester International Airport (IATA: RST, ICAO: KRST, FAA LID: RST) is a nonhub primary airport located seven miles (11 km) southwest of the central business district of Rochester, a city in Olmsted County, Minnesota, United States.
 It is the second busiest airport in Minnesota, however it is the third busiest airport for commercial airlines in Minnesota, behind Duluth International Airport .
 It used to be called "Rochester Municipal Airport", which was its name before adding customs and immigration facilities specifically for Mayo Clinic purposes in 1995.
Los Angeles International Airport (IATA: LAX, ICAO: KLAX, FAA LID: LAX) is the largest and busiest airport in the Greater Los Angeles Area and the state of California, the second busiest airport in the United States, as well as one of the largest international airports in the world.
 It is the only airport in the world to serve as a hub for five major airlines.

Question: Which is airport is located in German and second busiest airport in Germany and operates a dense domestic and European network as a member of Lufthansa Cityline? 
Answer: Munich Airport