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Harry Potter Madame Hooch Hat () Extreme Halloween, Inc. View detail of this item

I've been wondering why Madam Hooch isn't called "Professor"? Professor McGonagall is a teacher at Hogwarts School of Witchcraft and Wizardry. Madam Pomfrey is kind of a school doctor, and that's why, I suppose, she has a bit different position from those of other teachers. But, why is Madam Hooch, who has her own class, is called "Madam" instead of "Professor" by everyone? Is it because she is an instructor to teach how to play Quidditch? I'm very curious about it.