CREATE TABLE table_13336122_3 (original_air_date VARCHAR, directed_by VARCHAR)

When did the episode directed by David Duchovny originally air?
SELECT original_air_date FROM table_13336122_3 WHERE directed_by = "David Duchovny"
SELECT "original_air_date" FROM "table_13336122_3" WHERE "David Duchovny" = "directed_by"