Kitty Hawk Flyer, the Larry Page-backed “sky taxi,” seems like a great summer escape machine. One can learn to fly it in about an hour, but it will remain low and slow enough to give the thrill of flight without inordinate dangers. That’s the marketing pitch from Kitty Hawk, and it’s not a bad one. Imagine going to a beach or lake with dozens of these fluttering about over the water’s surface. It’s the same kind of lure driving go-karts on a miniature race course has for vacationers. Safety is obviously a factor for a machine meant for amateur use. John Lyon explains this in the Robb Report: “The zero-emissions Flyer is completely powered by electricity, and its propellers all operate independently, meaning that if there is a problem with one or more propellers, the entire vehicle won’t come crashing down. That said, even if it did, the aircraft is only meant for flying over water and only flies between …