CREATE TABLE table_2409041_3 (no_in_series NUMBER, original_air_date VARCHAR2)

What series number had an original airdate of March 1, 1991?
SELECT MIN(no_in_series) FROM table_2409041_3 WHERE original_air_date = "March 1, 1991"
SELECT MIN("no_in_series") FROM "table_2409041_3" WHERE "March 1, 1991" = "original_air_date"