When 21 is the number in series what is the air date?
CREATE TABLE table_2409041_2 (original_air_date VARCHAR, no_in_series VARCHAR)
SELECT original_air_date FROM table_2409041_2 WHERE no_in_series = 21
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_2409041_2 (original_air_date VARCHAR, no_in_series VARCHAR) Question: When 21 is the number in series what is the air date? [/INST] SELECT original_air_date FROM table_2409041_2 WHERE no_in_series = 21 </s>