Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_24399615_3 (viewers INTEGER, airdate VARCHAR)

### Question ###
How many viewers were there for airdate is 22 october 2009?

### Accurate SQL ###

SELECT MAX(viewers) FROM table_24399615_3 WHERE airdate = "22 October 2009"