What was the original air date when ed horowitz wrote it?
CREATE TABLE table_10539 (
    "Episode #" text,
    "Title" text,
    "Directed by" text,
    "Written by" text,
    "Original airdate" text
)
SELECT "Original airdate" FROM table_10539 WHERE "Written by" = 'ed horowitz'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What was the original air date when ed horowitz wrote it? ### Input: CREATE TABLE table_10539 (
    "Episode #" text,
    "Title" text,
    "Directed by" text,
    "Written by" text,
    "Original airdate" text
) ### Response: SELECT "Original airdate" FROM table_10539 WHERE "Written by" = 'ed horowitz'