What is the {military airbase} for {place served by transport hub} of {Belgrade}
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When did military airbase for place served by transport hub of Belgrade?
SELECT DISTINCT ?y WHERE { ?y rdf:type ontology:airbase . ?y property:place_served_by_transport_hub resource:Belgrade }
select distinct ?subj where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?subj . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P931> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q3711> . ?subj <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q695850> } 
 select distinct ?sbj where { ?sbj wdt:P931 wd:Q3711 . ?sbj wdt:P31 wd:Q695850 } 
Batajnica Air Base