CREATE TABLE table_28859177_3 (production_code VARCHAR, original_air_date VARCHAR)

What is the production code for the episode that aired on October 15, 2004?
SELECT production_code FROM table_28859177_3 WHERE original_air_date = "October 15, 2004"
SELECT "production_code" FROM "table_28859177_3" WHERE "October 15, 2004" = "original_air_date"