What is the {airport} for {airline hub} of {American Airlines}
What airport has an airline hub for American Airlines?
 select distinct ?obj where { wd:Q32396 wdt:P113 ?obj . ?obj wdt:P31 wd:Q1248784 } 
select distinct ?obj where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q32396> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P113> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj . ?obj <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q1248784> } 
What airplane terminal has an carrier center for American Airlines?