Table: tv_episodes_27
Columns: series
season
original_air_date
production_code
episode_title

Question: What date did episode 4 in the season originally air?
SQL: SELECT "original_air_date" FROM tv_episodes_27 WHERE "season" = 4

Question: What date did episode 115 in the series originally air?
SQL: SELECT "original_air_date" FROM tv_episodes_27 WHERE "series" = 115