Question: How many viewers in millions watched the episode with the production code 6ACX16?
SQL: SELECT "U.S. viewers (million)" FROM "1-22261877-1" WHERE "Production code" = '6ACX16';

Question: What is the air date of the episode with the production code 6ACX19? 
SQL: SELECT "Original air date" FROM "1-22261877-1" WHERE "Production code" = '6ACX19';