What is the relationship between Vueling and Barcelona 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.

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