SELECT COUNT("Original air date") FROM table_24871 WHERE "Production code" = '11.19'
when was the episode premiere if the production code is 11.19?
CREATE TABLE table_24871 (
    "No. in series" real,
    "No. in season" real,
    "Title" text,
    "Directed by" text,
    "Written by" text,
    "Original air date" text,
    "Production code" text
)