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Samoa Air  started operations on January 18 1987 mainly serving the community needs of  American Samoa  from its base at Pago Pago .
 country of headquarters: Samoa Air, American Samoa
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:
 country of headquarters: Samoa Air, American Samoa