CREATE TABLE aircraft (aid NUMBER, name CLOB, distance NUMBER)
CREATE TABLE employee (eid NUMBER, name CLOB, salary NUMBER)
CREATE TABLE flight (flno NUMBER, origin CLOB, destination CLOB, distance NUMBER, departure_date TIME, arrival_date TIME, price NUMBER, aid NUMBER)
CREATE TABLE certificate (eid NUMBER, aid NUMBER)

What are the names of all aircrafts that John Williams have certificates to be able to fly?
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" "T1" JOIN "certificate" "T2" ON "T1"."eid" = "T2"."eid" JOIN "aircraft" "T3" ON "T2"."aid" = "T3"."aid" WHERE "John Williams" = "T1"."name"