Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
when was the premiere of the episode whose production code is 415?

### Inputs:
table_name: table, columns: ['No. in series', 'No. in season', 'Title', 'Directed by', 'Written by', 'U.S. viewers (millions)', 'Original U.S. air date', 'Prod. code']

### Response:
SELECT Original U.S. air date FROM table WHERE Prod. code = 415