Add Yahoo as a preferred source to see more of our stories on Google. Lights illuminate the economy class cabin of an Airbus A350 XWB aircraft Inside a Japan Airlines Co. Kiyoshi Ota/Getty Images ...

If you've ever been hanging out on a tall hill at night, you've probably seen some lights flashing in the dark sky above. No, it's not a mysterious UFO — the kind there are problems studying – spying ...