Utilize the input text as a context reference, choose the right relationship between British Airways and London 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.

Virgin Atlantic secured nine of Little Red’s 12 London Heathrow slot pairs as part of a European Commission remedy package, when British Airways (BA) acquired bmi.

Answer: headquarters_location