In the race to build a so-called personal flying machine, few developers have got much past the tethered-hop stage, with promises of one in every garage sometime soon. Generations of hopeful flyers have died waiting. But Israel's Urban Aeronautics at least addresses a key point: A machine like the X-Hawk concept shown here (which the company recently released, saying it's the design they'll build) has less chance of serving your average frustrated commuter's needs than of playing a utility role in commercial and government transport. Projected uses include urban rescue, repair and patrol.