What is the original air date where tracy poust & jon kinnally was written by?
CREATE TABLE "table1_22570439_1" (
  "series_num" real,
  "season_num" real,
  "episode_title" text,
  "written_by" text,
  "directed_by" text,
  "u_s_viewers_millions" text,
  "original_air_date" text
);
SELECT "original_air_date" FROM "table1_22570439_1" WHERE "written_by"='Tracy Poust & Jon Kinnally';