Utilize the input text as a context reference, choose the right relationship between Vueling and Barcelona 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.

And I think that Vueling is an opportunity that we have, is operator with the right cost structure that they have developed very well a Barcelona base, that I think that they are doing also a very good job in Italy and France.

Answer: location_of_formation