Explaining Flights | Aviation on Instagram: "Follow @explainingflights for aviation stories that explain why rules exist. This tragic incident shows how small lapses can have devastating consequences. In 1998, Proteus Airlines Flight 706 collided mid-air with a light aircraft while flying under visual flight rules. One aircraft failed to properly apply the basic “see and avoid” principle, while the other did not have its transponder switched on — making it invisible to radar and other traffic al