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_1140105_6 (constructor VARCHAR, circuit VARCHAR)
### Question:
what is the name of the constructor that has the circuit zeltweg airfield?
### Answer:
SELECT constructor FROM table_1140105_6 WHERE circuit = "Zeltweg Airfield"