>How come helicopters have surface access but balloons don't? Why does NASA think you can't land a balloon? Atmospheric pressure differential being what it is,

>How come helicopters have surface access but balloons don't? Why does NASA think you can't land a balloon? Atmospheric pressure differential being what it is, there are only certain regions that the balloon can operate. The point is, there are only certain regions the copters can operate too, but by combining both the entire spectrum can be covered.