In a large mixing bowl, or in the bowl of an electric mixer, stir together the flour, sugar, salt, and baking soda. Make a well in the center of the dry ingredients. In a separate bowl, whisk together the eggs, bananas, oil, undrained crushed pineapple, and vanilla. Add the egg mixture to the dry ingredients, stirring until just combined, scraping the bowl periodically. Do not overmix the batter.