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_2866503_1 (us_air_date VARCHAR, us_viewers__million_ VARCHAR)
### Question:
What is the U.S. air date when the U.S. viewers are 7.5 million?
### Answer:
SELECT us_air_date FROM table_2866503_1 WHERE us_viewers__million_ = "7.5"