1767
United Nations Security Council resolution 616 adopted unanimously on 20 July 1988 after hearing representations from the Islamic Republic of  Iran  the Council expressed its distress at the downing of  Iran Air  Flight 655 over the Strait of Hormuz by a missile from the USS Vincennes during the conflict between Iran and Iraq .
 country of headquarters: Iran, Iran Air
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:  Iran, Iran Air 
Answer:
 country of headquarters: Iran, Iran Air