12866
American Airlines and  United Airlines  both operate a special service on the JFK-LAX and JFK-SFO routes known as american flagship service and  United p.s.  ( p.s. stands for premium service ) respectively .
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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:
 NA: United Airlines, United p.s.