What was the airdate of 21 series number?
CREATE TABLE table_11630008_3 (original_air_date VARCHAR, series_no VARCHAR)
SELECT original_air_date FROM table_11630008_3 WHERE series_no = 21
### 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