What is the {aircraft family} for {item operated} of {American Airlines}
What sorts of airplanes do American Carriers operate?
What kinds of airplanes do American Airlines operate?
SELECT DISTINCT ?m WHERE { ?m rdf:type ontology:aircraft_family . resource:American_Airlines property:item_operated ?m }
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/P121> . ?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/Q15056993> } 
 select distinct ?obj where { wd:Q32396 wdt:P121 ?obj . ?obj wdt:P31 wd:Q15056993 } 
Lockheed L-049 Constellation Douglas DC-2 DC-3 McDonnell Douglas MD-80 family McDonnell Douglas DC-10 Convair 990 Coronado Douglas DC-6 BAe 146 DC-4 Ford Trimotor Douglas DC-7 Lockheed L-188 Electra Convair CV-240 family T-32 Condor II Airbus A321 Boeing 737 Boeing 707 Boeing 717 Boeing 727 Boeing 757 Boeing 777 Boeing 787 Dreamliner Airbus A300 A320neo family BAC One-Eleven McDonnell Douglas MD-11