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British Airways PLC  said Wednesday it is expanding its operations at London City Airport by more than 70 percent with the launch of its new subsidiary  BA CityFlyer  .
 subsidiaries: British Airways PLC, BA CityFlyer
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "relation1: word1, word2; relation2: word3, word4". 
Option: cities of residence, top members employees, members, alternate names, origin, state or provinces of residence, title of person, spouse, city of headquarters, NA, founded by, state or province of headquarters, employee of, countries of residence, country of birth, founded, subsidiaries, country of headquarters 
Text: {0} 
Answer:
 subsidiaries: British Airways PLC, BA CityFlyer