what is the name of the constructor that has the circuit zeltweg airfield?
CREATE TABLE table_16761 (
    "Race Name" text,
    "Circuit" text,
    "Date" text,
    "Winning driver" text,
    "Constructor" text,
    "Report" text
)
SELECT "Constructor" FROM table_16761 WHERE "Circuit" = 'Zeltweg Airfield'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: what is the name of the constructor that has the circuit zeltweg airfield? ### Input: CREATE TABLE table_16761 (
    "Race Name" text,
    "Circuit" text,
    "Date" text,
    "Winning driver" text,
    "Constructor" text,
    "Report" text
) ### Response: SELECT "Constructor" FROM table_16761 WHERE "Circuit" = 'Zeltweg Airfield'