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

Over the past couple of years, Kenya Airways has expanded its operations on continent and beyond, and its training school in Nairobi is rated first in the sub-region by IATA.

Answer: location_of_formation