Preheat oven to 350 degrees
Combine flour, sugar, baking soda and cinnamon in a large mixing bowl, mix well with a wire whisk.
Pour pineapple into a small bowl, add vanilla, melted butter and eggs.
Add bananas to pineapples mixture and mix with spatula.
Add the pineapple and bananas to the dry ingredients and mix well with a spatula.
Pour into a sprayed 9 x 13 baking dish and bake for 40 to 45 minutes.