Utilize the input text as a context reference, choose the right relationship between Ryanair and Dublin airport from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

IAG's plan to buy Aer Lingus and build a new transatlantic hub at Dublin airport won the support last week of Ryanair , which holds a 30pc stake in its rival, after convincing the Irish government to sell its 25pc stake in May .

Answer: headquarters_location