CREATE TABLE table_29583441_1 (original_air_date VARCHAR, directed_by VARCHAR)

What date did the episode that was directed by Christian i. nyby ii originally air on?
SELECT original_air_date FROM table_29583441_1 WHERE directed_by = "Christian I. Nyby II"
SELECT "original_air_date" FROM "table_29583441_1" WHERE "Christian I. Nyby II" = "directed_by"