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_29087004_2 ( united_states_original_airdate VARCHAR, written_by VARCHAR )

### Question ###
What is the original United States air date of the episode written by Mike Ferris?

### Accurate SQL ###

SELECT united_states_original_airdate FROM table_29087004_2 WHERE written_by = "Mike Ferris"