CREATE TABLE table_24871 ("No. in series" FLOAT, "No. in season" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code" TEXT)

when was the episode premiere if the production code is 11.19?
SELECT COUNT("Original air date") FROM table_24871 WHERE "Production code" = '11.19'
SELECT COUNT("Original air date") FROM "table_24871" WHERE "Production code" = '11.19'