I just wonder why, if we ourselves could stay still in the air (or just float in the air using something such as a hot air balloon). Why doesn't the world rotate around us, allowing us to travel around the world in 24 hours?
This question belongs to physics. Objects tend to keep their velocity (direction and speed). So, if you're standing on the surface of the Earth, you're already traveling with the surface. When you take off on a hot air balloon, you keep that extra velocity due to the rotation of the Earth. The surface won't rotate underneath the balloon in flight.