Can the idea of magnetic propulsion applied in magnetically levitated trains be used in aerospace? My conceptual model is as follows : using the magnetic field of earth ( very weak I know) to repel a superconducting coil, with large surface area and moving very fast . Thus the lifting force should be enough for aviation . for example : make aircraft wings from a super conductor plate at the bottom and a paramagnetic material from the top so repelling magnetic field lines beneath the wings. I know that would require a huge wing span and very high speed but , What about the concept?