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_217785_2 ( season VARCHAR, ranking VARCHAR )

### Question ###
When did the season finale ranked at 73 first air?

### Accurate SQL ###

SELECT season AS finale FROM table_217785_2 WHERE ranking = 73