text: Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
  ### Context:
  CREATE TABLE table_24399615_4 (airdate VARCHAR, bbc_three_weekly_ranking VARCHAR)
  ### Question:
  What date did the episode air that had n/a for it's bbc three weekly ranking?
  ### Answer:
  SELECT airdate FROM table_24399615_4 WHERE bbc_three_weekly_ranking = "N/A"