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 air date, Production code
###Question: What date was the episode originally aired that was directed by James Widdoes and the production code is 320?
gpt
SELECT Original air date FROM table WHERE Directed by = James Widdoes AND Production code = 320