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

### Instruction:
What are the original air date(s) for episodes with 8.63 million viewers?

### Inputs:
table_name: table, columns: ['Episode #', 'Production Count', 'Original Airdate', 'Prod. Code', 'Title', 'Viewing Figures Millions']

### Response:
SELECT Original Airdate FROM table WHERE Viewing Figures Millions = 8.63