Table: tv_episode_data_75
Columns: no_in_series
no_in_season
title
directed_by
written_by
original_air_date
production_code
u_s_viewers_million

Question: How many viewers in millions watched the episode with the production code 6acx16?
SQL: SELECT "u_s_viewers_million" FROM tv_episode_data_75 WHERE "production_code" = '6ACX16'

Question: What is the air date of the episode with the production code 6acx19? 
SQL: SELECT "original_air_date" FROM tv_episode_data_75 WHERE "production_code" = '6ACX19'