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_37 (in_service INTEGER, aircraft VARCHAR)
### Question:
How many Antonov An-2 Colt aircraft are in service?
### Answer:
SELECT AVG(in_service) FROM table_name_37 WHERE aircraft = "antonov an-2 colt"