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_11630008_3 (original_air_date VARCHAR, series_no VARCHAR)
  ### Question:
  What was the airdate of 21 series number?
  ### Answer:
  SELECT original_air_date FROM table_11630008_3 WHERE series_no = 21