Put your vision to the test by trying this puzzle, which asks you to spot the plane in the sky. As aircraft tend to ... visible to the naked eye, the grey-toned background is harder to decipher.

Despite being huge, airplanes can disappear in the sky. Foggy or grey conditions can make it tricky ... stumped when attempting to locate plane. One user quipped: "I don't know but I found some ...

NEW JERSEY - Is it a drone, a plane or a helicopter in the sky? Experts who study unmanned ... anti-collision light that's visible 3 miles away. But drone owners can add other lights, so some ...