Ah, but this is explained by the magic of "gravity". This amazing force drags the plane and the entire atmosphere around the globe as if it were attached by an iron rod even when it's 30,000 feet up. But, then, of course, the small flap of a butterfly's wings can allow it to move westward with no more difficulty than it moves eastward. If gravity were that powerful a force that it dragged things around at 1,000 MPH, then in order for this butterfly to move westward, that should prove to be more difficult than what a salmon has to do swimming upstream. But there's no difference in exertion whether it's floating east or floating west. In fact, it has no sense of direction based on any difference in the required exertion. Then there are flights from North going SouthWest. Not only does the plane have to fly south, it has to counteract this iron-grip pull of the earth toward East. Or if a plane were to fly from the North Pole to the equator due south, at the North Pole, the earth is only rotating in at an extremely slow pace. But then as it flew south, the speed of the movement of the surface underneath would increase, and the angular momentum of the plane and the exertion required to counteract the force would have to constantly increase. Does a pilot have to increase the engine throttle as he moves south and the pull of gravity causes it to move eastward at an ever-faster pace?
It's utterly absurd.
Now, technically, this speaks more to a stationary earth than a flat earth per se.
Michelson-Morley and Airy's Failure also proved that the planet is not rotating but rather that the stars revolve around it.
This is one of the things that pushed me towards Flat Earth. The whole globe earth-spinning 1000 MPH-gravity model just doesn't work in reality.
Your example of the butterfly is a slam-dunk, in my opinion. The bit about air molecules at 100 feet, 1000 feet, and 10,000 feet and 100,000 feet all being connected to the earth below as with an iron rod -- that's exactly what they teach, and it's insane in my opinion. It is heavy brainwashing (like "wear a mask to stay safe") but it has no bearing on reality, once you look into it. It has ZERO science and all religion.
Well, I don't need their religion. I have the Catholic Faith, thankyouverymuch.