Database: simpson_episodes
Question: The person named Al Jean achieved the Primetime Emmy Award category in 2009, which episode did AI Jean achieve?
SQL: SELECT T2.episode_id FROM Award AS T1 INNER JOIN Episode AS T2 ON T1.episode_id = T2.episode_id WHERE SUBSTR(T1.year, 1, 4) = '2009' AND T1.person = 'Al Jean' AND T1.award_category = 'Primetime Emmy';