I think we should place all of the flying whales directly next to each other on the plane.  It would be entertaining to watch two of them side by side arguing over who has a right to an extra half a seat that the other one paid for.  They could create designated fat rows where the seats were the same size as normal (so as not to give them extra space they didn't pay for), but where only fat passengers were allowed to sit.  This would keep them away from human passengers and ensure that no one else has to sit in the destroyed seats.  Those poor seats are soaked in greasy sweat and have racing stripes, so it's really not fair to make actual humans sit there ever again.