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According to The National despite the shutdown of its executive jets management business  Istithmar World  Aviation still has other investments including stakes in  Dubai  Aerospace Enterprise an aviation investment firm whose holdings include aviation engineering and maintenance firms in the United States and Daallo Airlines a carrier based in Dubai .
 None
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:   
Answer:
 NA: Istithmar World, Dubai