Okay, now suppose that this aircraft was so cavernous that these geese could fly and not be in ground effect. We wouldn't have a downward pressure on the deck from the flapping wings, okay the air would be still supporting their weight but who says this is a truly closed system.
Even if it is, if all the geese now start to glide at the same time, a higher pressure would be generated under the wings, but a lower pressure above. :. Because this craft is so huge the pressure on the floor of this craft would remain the same.
I think.
I just doesn’t seem right that the only difference would be due to the decrease in gravitational pull because they increased their altitude.