Wouldn't a subway or train be 100 times more cost effective and safe? In a connected city asky taxi alleviates 1 car from traffic, a subway alleviates thousands. Not to mention the extreme danger of helicopters and tall buildings. Helicopters are easily affected by upa and downdrafts, and large buildings in cities typically create these conditions. Seems very dangerous to put a bunch of these out, even experienced helicopter pilots need practice with a new machine. On top of that what about air traffic control and landing? Do I have to schedule my rides in advance to avoid mid air collision? Will buildings have to be reinforced for landing pads?