What is the aircraft for 21 crews?
CREATE TABLE table_23508196_5 (type_of_aircraft VARCHAR, number_of_crews VARCHAR)
SELECT type_of_aircraft FROM table_23508196_5 WHERE number_of_crews = "21"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_23508196_5 (type_of_aircraft VARCHAR, number_of_crews VARCHAR) Question: What is the aircraft for 21 crews? [/INST] SELECT type_of_aircraft FROM table_23508196_5 WHERE number_of_crews = "21" </s>