Ryanair will formally agree to sell its 29.8% Aer Lingus stake to International Airlines Group (IAG) on July 16, marking a major milestone for IAG’s Aer Lingus takeover plans .
Utilize the input text as a context reference, choose the right relationship between 'Aer Lingus' and 'International Airlines Group' from the options.
Options: owner of, parent organization, member of, creator