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 .
In the context of the input sentence, determine the relationship between 'Ryanair' and 'Dublin airport'.
Options: headquarters location, chief executive officer, publisher, owned by