What is the relationship between British Airways and International Airlines Group in the context of the input sentence. Choose an answer from: 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.

British Airways and Iberia holding company International Airlines Group (IAG) said Thursday it had ordered 31 Airbus plans, including firm orders for 11 longhaul craft for its Spanish airline.

Answer: parent_organization