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_15637071_1 (fleet_size INTEGER, callsign VARCHAR)
### Question:
What is the fleet size of the airline which has a callsign of cool red?
### Answer:
SELECT MIN(fleet_size) FROM table_15637071_1 WHERE callsign = "COOL RED"