6170
Air China Cargo  owns seven Boeing 747 freighters and also sells cargo space on  Air China  's passenger flights .
 subsidiaries: Air China Cargo, Air China
Given options, please tell me the relationships of all the listed entity pairs.Output format is "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} 
 Entity Pairs:  Air China Cargo, Air China 
Answer:
 subsidiaries: Air China Cargo, Air China