CREATE TABLE table_73636 ("Episode number Production number" TEXT, "Title" TEXT, "Original airdate" TEXT, "Rating/Share in Households" TEXT, "18\\u201349 Rating Live+SD / Live+7" TEXT, "Share" TEXT, "Live+SD Total viewers" TEXT, "Live+7 Day DVR Total viewers" TEXT)

When did the fourth episode of the season (4 1-04) first air?
SELECT "Original airdate" FROM table_73636 WHERE "Episode number Production number" = '4 1-04'
SELECT "Original airdate" FROM "table_73636" WHERE "Episode number Production number" = '4 1-04'