Question: Which continents can be reached by flight companies available on Gatwick Airport?
SPARQL:
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/targetAirport> <http://dbpedia.org/resource/Gatwick_Airport> . ?x <http://dbpedia.org/property/destinations> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Airline>}