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 .
What is the relationship between 'Aer Lingus' and 'Dublin airport' in the context of the input sentence.
Options: chairperson, headquarters location, publisher, manufacturer