Utilize the input text as a context reference, choose the right relationship between British Airways and International Airlines Group from the options. Options: 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