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_1876825_6 (original_air_date VARCHAR, production_code VARCHAR)

### Question ###
What was the original air for the 06-03-521 production code?

### Accurate SQL ###

SELECT original_air_date FROM table_1876825_6 WHERE production_code = "06-03-521"