10442
Mesaba Airlines  a  Northwest Airlines  affiliate suspended service service to Detroit in June 2009 .
 subsidiaries: Mesaba Airlines, Northwest Airlines
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:  Mesaba Airlines, Northwest Airlines 
Answer:
 subsidiaries: Mesaba Airlines, Northwest Airlines