What is the parent company of the non-British airline company for which William Mathew Walsh is CEO? 
Willie Walsh (businessman): William Matthew "Willie" Walsh (born 25 October 1961) is an Irish airline executive. Aer Lingus:  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.
i don't know