Given the input sentence, please extract the subject and object containing a certain relation in the sentence according to the following relation types, in the format of "relation1: word1, word2; relation2: word3, word4". Relations include: 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.

Kevin Leung, Country Commercial Manager at British Airways said, 'We are pleased that Airtel Premier customers now have the advantage of travelling between Accra and London and over 150 destinations at specially discounted rates.

Answer: location_of_formation: British Airways, London; headquarters_location: British Airways, London