If a plane were to ﬂy over a very large scale, the scale would register the weight of the plane.
Reminds me of a puzzle. A farmer is carrying a truckload of chickens to market. He is stopped at a weighing station, and the truck is over the weight limit. So he arranges to be weighed again, and makes a loud noise to get the chickens to fly in the truck while it is on the scale.