SELECT T3.name FROM Employee AS T1 JOIN Certificate AS T2 ON T1.eid  =  T2.eid JOIN Aircraft AS T3 ON T3.aid  =  T2.aid WHERE T1.name  =  "John Williams"
Show names for all aircrafts of which John Williams has certificates.
SELECT T3.name FROM Employee AS T1 JOIN Certificate AS T2 ON T1.eid = T2.eid JOIN Aircraft AS T3 ON T3.aid = T2.aid WHERE T1.name = `` John Williams ''
select t3 . name from employee as t1 join certificate as t2 on t1 . eid = t2 . eid join aircraft as t3 on t3 . aid = t2 . aid where t1 . name = value
Show names for all aircrafts of which John Williams has certificates .