Did {Concorde} {operator} {British Airways} and {Lufthansa} ?
Did both British Airways and Lufthansa have Concord as operator?
Was Concorde the operator of both British Airways and Lufthansa?
ASK WHERE { resource:Concorde property:operator resource:Lufthansa . resource:Concorde property:operator resource:British_Airways }
 ASK { ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q6505> . ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P137> . ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q8766>. ?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q6505> . ?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P137> . ?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q9325>. } 
ASK WHERE { wd:Q6505 wdt:P137 wd:Q8766 . wd:Q6505 wdt:P137 wd:Q9325 }