Original airdate for #6 with 1.246 viewers?
CREATE TABLE "series_3_2009_ratings" (
  "episode" real,
  "original_airdate" text,
  "timeslot_approx" text,
  "viewers_millions" real,
  "nightly_rank" text
);
SELECT "original_airdate" FROM "series_3_2009_ratings" WHERE "nightly_rank"='#6' AND "viewers_millions"=1.246;