I thought F1 cars had solved
I thought F1 cars had solved this many years ago by being able to driven upside down and stay attached we just need to build the roads. The military also seem to have few problems putting tanks in planes and then dropping them from the sky with a parachute to allow them to be used when they reach earth. For personal transport both in the air and on the ground in areas such as cities and urban conurbations I like the approach of the guy who is going to jump out of a helicopter from height then safely land on some cardboard boxes using a wing suit, improvements might include some propulsion, considering passengers and luggage.