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

### Instruction:
What aircraft was introduced in 2004 and has a retired of —?

### Inputs:
table_name: table, columns: ['Aircraft', 'Introduced', 'Retired', 'Seating', 'Notes']

### Response:
SELECT Aircraft FROM table WHERE Retired = — AND Introduced = 2004