Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_69074 ( "Episode No." real, "Airdate" text, "Total Viewers" real, "Share" text, "BBC One Weekly Ranking" real )

### Question ###
What were the air-dates of the episodes before episode 4 that had a BBC One weekly ranking of 6?

### Accurate SQL ###

SELECT "Airdate" FROM table_69074 WHERE "Episode No." < '4' AND "BBC One Weekly Ranking" = '6'