Question: What is the parent company of the non-British airline company for which William Mathew Walsh is CEO? 

Context paragraphs:
NAM Air: NAM Air is an Indonesian airline based in Jakarta that commenced its operation on December 11, 2013.  Headquartered in Central Jakarta, the airline acting as feeder of its parent company, Sriwijaya Air, using 11 737-500 Winglets with 8 Executive Class seats and 112 Economy Class seats.  In September 26, 2013, its parent company Sriwijaya Air announces for purchasing up to 100 R-80 regional planes for its future operations.  The airline is listed as a Category 1 airline by Indonesia's Civil Aviation Authority, the highest status that can be achieved for operational safety.

William McInnes: Daryl William Mathew Gabriel McInnes (born 10 September 1963) is an Australian film and television actor and writer.  He portrays the role of Matt Tivolli in "The Time of Our Lives".  He is best known for his roles as Senior Constable Nick Schultz in "Blue Heelers" and Max Connors in "SeaChange".

Aer Lingus: Aer Lingus, ( , an anglicisation of the Irish "aerloingeas" meaning "air fleet") is the flag carrier airline of Ireland and the second-largest airline in Ireland.  Founded by the Irish government, it was privatised between 2006 and 2015 and it is now a wholly owned subsidiary of International Airlines Group (IAG), the parent company of British Airways and Iberia.  The airline's head office is on the grounds of Dublin Airport in Cloghran, County Dublin, Ireland.

American Airlines Group: American Airlines Group, Inc. is an American publicly traded airline holding company headquartered in Fort Worth, Texas.  It was formed December 9, 2013, in the merger of AMR Corporation, the parent company of American Airlines, and US Airways Group, the parent company of US Airways.  The airline groups together form the largest airline in the world, with more than 6,700 daily flights to 336 locations in 56 countries worldwide, about $40 billion in operating revenue, over 100,000 employees, and plans to take delivery of 607 new aircraft, including 517 narrowbody aircraft and 90 widebody international aircraft.  The integration of American Airlines and US Airways was completed when the Federal Aviation Administration granted a single operating certificate for both carriers on April 8, 2015.

W. M. Hodgkins: William Mathew Hodgkins (1833 – 9 February 1898) was a 19th-century New Zealand painter.

William Hale (professor): Professor William Mathew Hale (born 1940) is a specialist on Turkey and Turkish politics, and Professor of Politics with reference to Turkey at the School of Oriental and African Studies, University of London.

U-Land Airlines: U-Land Airlines (Chinese: 瑞聯航空; pinyin: Ruìlián hángkōng) was a Taiwanese low-cost airline.  The company was the first low-cost airline company in Asia, which operates domestic and short range international routes.  Bankrupted in 2001, it was affiliated to U-Land Building Co., Ltd before it ceases, and is the first airline company bankrupted in Taiwan.

HNA Infrastructure Investment Group: Hainan HNA Infrastructure Investment Group Co., Ltd. formerly Hainan Island Construction Co., Ltd. is a Chinese listed company based in Haikou.  in mid-2016 the company acquired HNA Infrastructure Group () in a reverse IPO from intermediate parent company HNA Infrastructure Holding Group (), which HNA Infrastructure Group is the parent company of HNA Real Estate and HNA Airport Group (, in turn HNA Airport Group is the parent company of HNA Airport Holdings (Group) () and HNA Airport Holdings is the parent company of Sanya Phoenix International Airport Co., Ltd.); HNA Airport Group is the largest shareholder of Haikou Meilan International Airport (19.58% as at October 2016), which in turn the largest shareholder of Hong Kong listed company HNA Infrastructure.  In December 2016 a proposed capital increase of the HK-listed company was announced.  HNA Infrastructure Investment Group would purchase a minority share directly.  Haikou Meilan International Airport was the second-largest shareholder of Hainan Airlines; Hainan Airlines, however, also owned a minority stake in Haikou Meilan International Airport.

Htoo Group of Companies: The Htoo Group of Companies (HGC) is a Burmese holding company, with headquarters at 5 Pyay Road, Hlaing Township, Yangon, Myanmar.  HGC is the parent company of Air Bagan, a privately held Burmese airline company.  The company has several subsidiaries.  Htoo Wood Products Company Ltd. is engaged in logging and export of timber (especially teak).  Htoo Trading Company, is engaged in construction, property development, agriculture, transportation, shipping, mining, hotels and tourism operations.  Htoo Trading Company and Asia World Company were the first two construction companies granted contracts to build the new national capital in Naypyidaw.  Htoo Trading Company is Burma's top private exporter and fifth largest overall, with gross revenues of $65.1 million.

Willie Walsh (businessman): William Matthew "Willie" Walsh (born 25 October 1961) is an Irish airline executive.  He is CEO of International Airlines Group, and has been CEO of Aer Lingus and British Airways.

Supporting paragraphs: Willie Walsh (businessman) Aer Lingus
Answer: International Airlines Group (IAG)