6542
Following its absorption into  British Airways  the  airline  's turboprops were retired while the company's fleet of regional short-haul jetliners and the associated crews were transferred to British Airways ' regional operation in Birmingham and Manchester .
 subsidiaries: British Airways, airline
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, airline