What is the relationship between 'Aer Lingus' and 'Dublin' in the context of the input sentence.
Options: location of formation, original broadcaster, parent organization, platform

Adding Aer Lingus to its portfolio of airlines - British Airways, Iberia and Spanish budget carrier Vueling - opens a new avenue of growth for IAG, allowing it to expand capacity on lucrative transatlantic routes by using Dublin Airport.
location of formation