Question: Who owns Shangdong Airlines which operates mainly domestic trunk routes and whose focus city is Qingdao in Shandong Province, China?
Context: Qingdao Liuting International Airport (IATA: TAO, ICAO: ZSQD) is the main airport serving the city of Qingdao in Shandong Province, China.  It is about 31 km from the city center.  Qingdao is a focus city for China Eastern Airlines and Shandong Airlines.  Its IATA code is used for its former romanized name Tsingtao. Qingdao–Rongcheng Intercity Railway is a high-speed railway located in China's, Shandong Province.  It travels along the Shandong Peninsula connecting to Qingdao and Rongcheng.  Line length is 298.842 km (containing a total length of sidings, spurs and depots etc. of 335 km ).  The design speed is based on 250 km/h service.  However, it has been reserved for the line to be upgraded, if warranted, to 300 km/h .  Construction consisted of a three-month preparation period, a building period of 27 months and with a joint testing and commissioning period of six months.  On December 28, 2014, the Qingdao–Rongcheng Intercity Railway opened from Jimo to Rongcheng.  The whole line is opened on November 16, 2016. 。 Qingdao University () is a key provincial research university located in Qingdao, China.  Qingdao University traces its origin to 1909, when "Deutsch-Chinesische Hochschule" (German-Chinese College), the oldest predecessor institution of Qingdao University, was jointly established by the Chinese and German governments in Qingdao.  In 1993, the former Qingdao University, Qingdao Medical College, Shandong Textile Engineering College, and Qingdao Normal College, merged to form the new Qingdao University.  At present, QU is one of the best comprehensive universities in Shandong Province, recognized as a member of the national "Excellent Engineer Education and Training Program."  With a strong profile in Medical Sciences, Textile and Design, Business, and liberal arts, QU serves 32,300 full-time undergraduate students, 7,400 graduate students, and 1,600 international students. The Zibo train collision () was a major train collision that occurred on the morning of April 28, 2008, near the city of Zibo, in Shandong province, People's Republic of China.  The accident occurred on the Jiaoji Railway, which links the important cities of Qingdao and Jinan in Shandong province.  With a death toll of 72 people and 416 injuries, the collision was the deadliest rail accident in the People's Republic of China since a 1997 accident in Hunan. The Qingdao Aquarium () also known as the Qingdao Underwater World () is the oldest public aquarium in China.  It is located in the city of Qingdao, Shandong Province.  The aquarium originated from an initiative launched by the educator Cai Yuanpei in 1930 and was first opened to the public on May 8, 1932.  As of 2013, the aquarium consists of four main exhibition halls that are connected by tunnels and provides nearly 10,000 square meters of total exhibition area.  The Qingdao Aquarium has been listed as a major historical and cultural sites protected by Shandong Province since 2006 (site number 3-267).  It is located right on shore of the Yellow Sea's Huiquan Bay (汇泉湾), next to the "No. 1 Bathing Beach" in the Shinan District of Qingdao. Shandong Airlines Co.Ltd.  (, nicknamed SDA or 山航 "Shānháng") is an airline based in the Shandong Airlines Center (山东航空大厦 "Shāndōng Hángkōng Dàshà") in Jinan, Shandong, China.  The Chinese carrier operates mainly domestic trunk routes from Jinan, Qingdao and Yantai to major cities in China.  It is owned by Air China and holds a 10 percent stake in Sichuan Airlines. Xiang Ming () (1909–1969) was a People's Republic of China politician.  He was born in Linqu County, Shandong Province.  In 1937, at the start of the Second United Front, he was Liu Shaoqi's secretary.  He was active in Henan Province and northern Jiangsu Province.  After the beginning of the second phase of the Chinese Civil War, he participated in the Menglianggu Campaign of May 1947.  He was briefly mayor of Qingdao before becoming Communist Party of China Committee Secretary of his home province.  In 1954, Xiang became involved in an anti-party conspiracy led by Gao Gang and Rao Shushi.  On July 3, 1954, the central government initiated proceedings to remove Xiang from his post as Party Chief of Shandong.  On September 7, 1954, the Shandong Party Committee informed the central government of its acceptance of Xiang's removal.  On October 10, 1954, Xiang was formally removed as Party Chief of Shandong and banned from political office.  During the Cultural Revolution, Xiang was persecuted and died as a result. Qingdao ( ; also spelled Tsingtao) is a city in eastern Shandong Province on the east coast of China.  It is the largest city in its province.  Administered at the sub-provincial level, Qingdao has jurisdiction over six districts and four county-level cities.  s of 2014 Qingdao had a population of 9,046,200 with an urban population of 6,188,100.  Lying across the Shandong Peninsula and looking out to the Yellow Sea, it borders Yantai to the northeast, Weifang to the west and Rizhao to the southwest. The Qingdao–Jinan Railway or Jiaoji Railway (, formerly the Shantung Railway) is railway in Shandong Province, China.  The railway is 393 km in length and connects Qingdao, on the Jiaozhou Bay, and Jinan, the provincial capital of Shandong.  Adolph von Hansemann and other German financiers funded construction of the railway, then known as "Schantung Eisenbahn Gesellschaft", which began September 23, 1899, and was completed in 1904.  Since the quadruple tracking of this corridor with the opening of the parallel Qingdao–Jinan Passenger Railway the line is mostly used for freight with some conventional passenger services. Qingdao Jiaodong International Airport is an airport being built to serve the city of Qingdao in Shandong Province, China.  It received approval in December 2013, and will replace the existing Qingdao Liuting International Airport as the city's main airport.  It will be located in Jiaodong, Jiaozhou, 39 km from the center of Qingdao.  Upon completion in 2019, it will be the largest airport in Shandong capable of handling 35 million passengers annually.
Answer: Air China