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_19428 ( "School Year" text, "Class A" text, "Class AA" text, "Class AAA" text, "Class AAAA" text, "Class AAAAA" text )

### Question ###
Who was the Class AAAA champion in 2006-07?

### Accurate SQL ###

SELECT "Class AAAA" FROM table_19428 WHERE "School Year" = '2006-07'