Show the fleet series of the aircrafts flied by pilots younger than 34
SELECT T2.Fleet_Series FROM pilot_record AS T1 JOIN aircraft AS T2 ON T1.Aircraft_ID  =  T2.Aircraft_ID JOIN pilot AS T3 ON T1.Pilot_ID  =  T3.Pilot_ID WHERE T3.Age  <  34
SELECT T2.Fleet_Series FROM pilot_record AS T1 JOIN aircraft AS T2 ON T1.Aircraft_ID  =  T2.Aircraft_ID JOIN pilot AS T3 ON T1.Pilot_ID  =  T3.Pilot_ID WHERE T3.Age  <  34
[{'Fleet_Series': '444-464 (21)'}, {'Fleet_Series': '474-481 (8)'}, {'Fleet_Series': '482-492 (11)'}, {'Fleet_Series': '465-467 (3)'}]