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_3518 ( "Episode #" text, "Season Episode #" text, "Title" text, "Directed by" text, "Written by" text, "Original air date" text, "Prod. code" text )

### Question ###
What is the number of air dates titled 'The Big Job'?

### Accurate SQL ###

SELECT COUNT("Original air date") FROM table_3518 WHERE "Title" = 'The Big Job'