human
Considering the provided database schema and associated query, produce SQL code to retrieve the answer to the query. 
###Database Schema: No. in series, No. in season, Title, Directed by, Written by, Original U.S. air date, Prod. code, Viewers (millions)
###Question: Which US air date had 4.4 million viewers?
gpt
SELECT Original U.S. air date FROM table WHERE Viewers (millions) = 4.4