If you're in an airplane and suddenly hear a loud bang or see a flash outside the window, your plane may have just been hit by lightning. When this happens, pilots are supposed to land as soon as possible so the craft can be inspected for potential damage to its skin, structure or electronics. This protocol is paramount for safety but can create costly flight delays and cancellations. Recent tests show that, perhaps counterintuitively, the best way to reduce the chances of a strike may be to add an electrical charge to the outside of the aircraft.