ok, im just hypothesising here, but if you were to create an vehicle which has a very strong positive charge on its base (with a van de graaf generator perhaps) and devices all around the edges somehow fired a stream of postive ions at the ground around it (in the same way that an antistatic gun does onto a record) in order to make the ground positivley charged all around it. Could you make the vehicle levitate and make it fly in one direction by reducing the amount of positive ions fired at the ground in that direction?
I just thought it might work since the charges in the vehicle base and the ground would repel each other since they are alike. feel free to dis this idea and prove it wrong if i am wrong i'm only wondering.