NEW JERSEY - Is it a drone, a plane or a helicopter in the sky? Experts who study unmanned aircraft systems, better known as drones, say it can be tough to tell from miles away. But there are clues.

Casey Steffens captures the athleticism, friendship and community behind the unique sport of performing stunts on a flying ...

Have you got a sharp eye? Put your vision to the test by trying this puzzle, which asks you to spot the plane in the sky. As aircraft tend to be huge, you shouldn't think it would be that difficult.