Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_18047346_4 (airport_name VARCHAR, location VARCHAR)
### Question:
If the location is Chicago, Illinois, what is the airport name?
### Answer:
SELECT airport_name FROM table_18047346_4 WHERE location = "Chicago, Illinois"