Graduate Highschool in a conservative state and you'll know exactly why you don't fly to the back of an air plane when your feet leave the ground. It's a combination of some very elementary concepts like momentum, acceleration, and reaction.
If the earth were held by electronagnetic forces, then you would fly to the back of the plane, if you miraculously get it flying in this situation.
Did you know things are heavier on the poles than the equator? Electromagnetic flat disk earth would need the opposite to be true.
Lastly, going through the van allen radiation belt would be like getting an x-ray, just with weak particle radiation. Good thing it's beyond UEO.
I'm sorry, it's just that you guys gotta have something better to do than tricking dummies into thinking we live on a flat earth.