CREATE TABLE table_name_67 (fatalities INT, airline VARCHAR, registration VARCHAR)

How many fatalities are there for the airline of spantax, with a registration of ec-arz?
SELECT AVG(fatalities) FROM table_name_67 WHERE airline = "spantax" AND registration = "ec-arz"
SELECT AVG("fatalities") FROM "table_name_67" WHERE "airline" = "spantax" AND "ec-arz" = "registration"