Which aircraft has the largest wingspan that can be used in a gliding competition?
select ?ent where { ?ent wdt:P31 wd:Q15056993 . ?ent wdt:P2112 ?obj . ?ent wdt:P366 wd:Q5569597 } ORDER BY DESC(?obj)LIMIT 5 
aircraft family: Q15056993 gliding competition: Q5569597