Tell me an aircraft power class part of a global airplane fleet, and which starts with "a".
SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q20027951 . ?sbj wdt:P1535 wd:Q24175399 . ?sbj rdfs:label ?sbj_label . FILTER(STRSTARTS(lcase(?sbj_label), 'a')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25 
aircraft power class: Q20027951 global airplane fleet: Q24175399