Question: Does Silver Airways have a hub at the Washington Dulles International Airport?
SPARQL query: ASK WHERE { <http://dbpedia.org/resource/Silver_Airways> <http://dbpedia.org/ontology/hubAirport> <http://dbpedia.org/resource/Washington_Dulles_International_Airport> }
Answer: [Yes], <Washington Dulles International Airport> is the <hub airport> of <Silver Airways>.