Question: Name the Lockheed-manufactured Constellation variant with the highest operating altitude ?
Paraphrase: What is the name of the Lockheed-manufactured Constellation  variant that has the highest operational altitude?
SPARQL (Wikidata): select ?ent where { ?ent wdt:P31 wd:Q16986328 . ?ent wdt:P2254 ?obj . ?ent wdt:P176 wd:Q7233 } ORDER BY DESC(?obj)LIMIT 5 
Answer: Lockheed L-049 Constellation, Lockheed L-649 Constellation