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_18047346_4 (airport_name VARCHAR, location VARCHAR)

### Question ###
If the location is Chicago, Illinois, what is the airport name?

### Accurate SQL ###

SELECT airport_name FROM table_18047346_4 WHERE location = "Chicago, Illinois"