CREATE TABLE "table1_22261877_1" (
  "no_in_series" real,
  "no_in_season" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text,
  "production_code" text,
  "u_s_viewers_million" text
);

Question: How many viewers in millions watched the episode with the production code 6acx16?
SQL: SELECT "u_s_viewers_million" FROM "table1_22261877_1" WHERE "production_code"='6ACX16';

Question: What is the air date of the episode with the production code 6acx19? 
SQL: SELECT "original_air_date" FROM "table1_22261877_1" WHERE "production_code"='6ACX19';