text: 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_13605170_2 (retired VARCHAR, aircraft_type VARCHAR)
  ### Question:
  how many Curtiss XBTC aircraft are retired?
  ### Answer:
  SELECT COUNT(retired) FROM table_13605170_2 WHERE aircraft_type = "Curtiss XBTC"