Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_60 (fatalities VARCHAR, tail_number VARCHAR)
### Question:
How many fatalities occurred for an unknown tail number?
### Answer:
SELECT fatalities FROM table_name_60 WHERE tail_number = "unknown"