What is 4zr's callsign?
CREATE TABLE table_name_67 (callsign VARCHAR, on_air_id VARCHAR)
SELECT callsign FROM table_name_67 WHERE on_air_id = "4zr"
### Context: CREATE TABLE table_name_67 (callsign VARCHAR, on_air_id VARCHAR) ### Question: What is 4zr's callsign? ### Answer: SELECT callsign FROM table_name_67 WHERE on_air_id = "4zr"