Which air date had the 18-49 rating/share of 3.3/9
CREATE TABLE "weekly_ratings" (
  "num" real,
  "episode" text,
  "air_date" text,
  "time_slot_est" text,
  "rating" text,
  "share" real,
  "18_49_rating_share" text,
  "viewers_m" text,
  "rank_overall" text
);
SELECT "air_date" FROM "weekly_ratings" WHERE "18_49_rating_share"='3.3/9';