CREATE TABLE table_3109 ("No. in series" FLOAT, "Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "Original air date" CLOB, "Production code" FLOAT)

What date did the episode with a production code of 447004 originally air?
SELECT "Original air date" FROM table_3109 WHERE "Production code" = '447004'
SELECT "Original air date" FROM "table_3109" WHERE "Production code" = '447004'