CREATE TABLE table_14724369_1 (original_air_date VARCHAR, directed_by VARCHAR)

When did the show directed by Michael Dimartino first air?
SELECT original_air_date FROM table_14724369_1 WHERE directed_by = "Michael DiMartino"
SELECT "original_air_date" FROM "table_14724369_1" WHERE "Michael DiMartino" = "directed_by"