CREATE TABLE table_11220799_2 (episode_titles VARCHAR2, first_air_date VARCHAR2)

How many episodes had their first air date on March 6, 2008?
SELECT COUNT(episode_titles) FROM table_11220799_2 WHERE first_air_date = "March 6, 2008"
SELECT COUNT("episode_titles") FROM "table_11220799_2" WHERE "March 6, 2008" = "first_air_date"