Which Callsign has an IATA of tr?
CREATE TABLE table_name_4 (callsign VARCHAR, iata VARCHAR)
SELECT callsign FROM table_name_4 WHERE iata = "tr"
### Context: CREATE TABLE table_name_4 (callsign VARCHAR, iata VARCHAR) ### Question: Which Callsign has an IATA of tr? ### Answer: SELECT callsign FROM table_name_4 WHERE iata = "tr"