CREATE TABLE table_11235334_2 (_number NUMBER, air_date VARCHAR2)

what is the most # that aired on september 29, 2008?
SELECT MAX(_number) FROM table_11235334_2 WHERE air_date = "September 29, 2008"
SELECT MAX("_number") FROM "table_11235334_2" WHERE "September 29, 2008" = "air_date"