I was a little concerned by the statement: "passengers only need to give two commands, "take off" and "land," each controlled by a single click on a Microsoft Surface tablet" - I just hope tht the tablet hasn't crashed or decided to reboot to install an update just at the point you want to land.
However, then I read this: "A passenger would have no controls as a backup, he said. In the event of a problem the company plans a remote control center that would take over the vehicle and ensure it lands safely" - I'm intrigued by what the remote control technology is that they are so confident that there will be no blackspots or areas of poor reception or interference! and let's hope a problem never arises in the remote control receiver!
Matthew