What original air date was for the episode with production code of 108?
CREATE TABLE "table1_24425976_2" (
  "series" real,
  "season" text,
  "original_air_date" text,
  "production_code" text,
  "episode_title" text
);
SELECT "original_air_date" FROM "table1_24425976_2" WHERE "production_code"='108';